# BasicSoundOutputDemo segmentation fault

**URL:** <https://psychtoolbox.discourse.group/t/basicsoundoutputdemo-segmentation-fault/1364>\
**Category:** Uncategorized\
**Created:** [October 20, 2009, 1:34pm UTC](https://psychtoolbox.discourse.group/t/basicsoundoutputdemo-segmentation-fault/1364 "2009-10-20T13:34:40Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![Allen\_Ingling](https://avatars.discourse-cdn.com/v4/letter/a/a183cd/32.png) [@Allen\_Ingling](https://psychtoolbox.discourse.group/u/Allen_Ingling)\
**Post date:** [October 20, 2009, 1:34pm UTC](https://psychtoolbox.discourse.group/t/basicsoundoutputdemo-segmentation-fault/1364/1 "2009-10-20T13:34:40Z")

</div>

Hi there,  
  
I tried to run the BasicSoundOutputDemo on my PC running XP SP3, and it crashed Matlab with a segmentation fault. See below for output. Looking through the archives of this group, I tried to find previous messages referring to this type of problem and found this:  
  
[http://tech.groups.yahoo.com/group/psychtoolbox/message/7249](http://tech.groups.yahoo.com/group/psychtoolbox/message/7249)  
  
Following the discussion, I tried typing the following on the commandline:  
  
PsychPortAudio('Verbosity', 10); % To enable more debug output...  
d=PsychPortAudio('GetDevices')  
  
The second statement caused the same crash. Any suggestions on what the problem might be? Could it be a SP3 issue?   
  
thanks!  
Mary  
  
  

> \>\> BasicSoundOutputDemo

Could not find a low-latency enhanced PortAudio driver. If you need  
really accurate sound onset timing and latency \< 30 msecs, please read  
"help InitializePsychSound" carefully and follow the instructions.  
Will use our standard driver instead of enhanced driver...  
Unknown Windows exception of type=c06d007e was not caught.  
------------------------------------------------------------------------  
 Segmentation violation detected at Tue Oct 20 09:24:39 2009  
------------------------------------------------------------------------  
  
Configuration:  
 MATLAB Version: 7.8.0.347 (R2009a)  
 MATLAB License: 2374  
 Operating System: Microsoft Windows XP  
 Window System: Version 5.1 (Build 2600: Service Pack 3)  
 Processor ID: x86 Family 6 Model 15 Stepping 11, GenuineIntel  
 Virtual Machine: Java 1.6.0\_04-b12 with Sun Microsystems Inc. Java HotSpot(TM) Client VM mixed mode  
 Default Encoding: windows-1252  
  
Fault Count: 1  
  
Register State:  
 EAX = 00c2bd28 EBX = 00000000  
 ECX = 00000000 EDX = 00000015  
 ESI = 00c2bdf0 EDI = 00000000  
 EBP = 00c2bd78 ESP = 00c2bd24  
 EIP = 7c812afb FLG = 00000202  
  
Stack Trace:  
 [0] kernel32.dll:0x7c812afb(0xc06d007e, 0, 1, 0x00c2bdec)  
 [1] PsychPortAudio.mexw32:0x055d4dd6(24, 0x00c2bd9c, 0x055eb22c "Open GetDeviceSettings ", 0)  
 [2] PsychPortAudio.mexw32:0x055d3f81(0x022a2bb8, 0, 0, 0x055eb250 "DeviceIndex")  
 [3] PsychPortAudio.mexw32:0x055cfdcd(0, 0, 0, 0)  
 [4] PsychPortAudio.mexw32:0x055c5a88(1, 0x00c2c690, 2, 0x00c2c600)  
 [5] libmex.dll:\_mexRunMexFile(1, 0x00c2c690, 2, 0x00c2c600) + 132 bytes  
 [6] libmex.dll:private: void \_\_thiscall Mfh\_mex::runMexFileWithSignalProtection(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(1, 0x00c2c690, 2, 0x00c2c600) + 73 bytes  
 [7] libmex.dll:public: virtual void \_\_thiscall Mfh\_mex::dispatch\_file(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(1, 0x00c2c690, 2, 0x00c2c600) + 321 bytes  
 [8] m\_dispatcher.dll:public: virtual void \_\_thiscall Mfh\_file::dispatch\_fh(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(1, 0x00c2c690, 2, 0x00c2c600) + 204 bytes  
 [9] m\_interpreter.dll:public: void \_\_thiscall ResolverFunctionDesc::CallFunction(int,struct mxArray\_tag \* \* const,int,struct mxArray\_tag \* \* const)(1, 0x00c2c690, 2, 0x00c2cdf8 "ÄÐÂ") + 81 bytes  
 [10] m\_interpreter.dll:public: bool \_\_thiscall Resolver::CallMFunction(int,int,class \_m\_operand \* const,union m\_operand\_storage \*,int,class \_m\_operand \* const,union m\_operand\_storage \*,int \*)(0x00c2c8d8, 1, 1, 0x10d86778) + 1209 bytes  
 [11] m\_interpreter.dll:private: bool \_\_thiscall accelImpl::MFunctionCall(struct \_accelOp \* \*)(0x0fa443a8, 0xffffffff, 0x10f3c4a0, 0x10f1efe0) + 266 bytes  
 [12] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelImpl::Exec(void)(0x00c2cdf8 "ÄÐÂ", 0xffffffff, 0xffffffff, 0x10f1efe0) + 170 bytes  
 [13] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelCode::Call(enum inMarshalType \*,int \*)const (0x00c2d098, 0xffffffff, 0, 0) + 115 bytes  
 [14] m\_interpreter.dll:public: static bool \_\_cdecl inJit::ExecuteHotSegment(struct \_inJitAccelInfo \*,enum opcodes \*,int \*,int \*)(0x00c2d1f4, 0x00c2d348, 0x00c2d2dc, 0x00c2d498) + 2523 bytes  
 [15] m\_interpreter.dll:int \_\_cdecl inInterp(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag volatile \*,int \*)(1, 764, 106, 0) + 826 bytes  
 [16] m\_interpreter.dll:int \_\_cdecl protected\_inInterp(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag \*,int \*)(1, 764, 80, 0) + 39 bytes  
 [17] m\_interpreter.dll:int \_\_cdecl inInterPcodeSJ(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag \*,int \*)(1, 764, 80, 0) + 251 bytes  
 [18] m\_interpreter.dll:int \_\_cdecl inExecuteMFunctionOrScript(class Mfh\_mp \*,bool)(0xffffff00, 0xffffffff, 0x10e8a390, 0) + 935 bytes  
 [19] m\_interpreter.dll:void \_\_cdecl inRunMfile(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*,class Mfh\_mp \*,struct inWorkSpace\_tag \*)(0, 0x00c2d830, 0, 0x00c2d7a0 "pØÂ") + 466 bytes  
 [20] m\_interpreter.dll:public: virtual void \_\_thiscall Mfh\_mp::dispatch\_file(struct \_mdUnknown\_workspace \*,int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0, 0x00c2d830, 0) + 23 bytes  
 [21] m\_interpreter.dll:public: virtual void \_\_thiscall Mfh\_mp::dispatch\_file(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0x00c2d830, 0, 0x00c2d7a0 "pØÂ") + 22 bytes  
 [22] m\_dispatcher.dll:public: virtual void \_\_thiscall Mfh\_file::dispatch\_fh(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0x00c2d830, 0, 0x00c2d7a0 "pØÂ") + 204 bytes  
 [23] m\_interpreter.dll:public: void \_\_thiscall ResolverFunctionDesc::CallFunction(int,struct mxArray\_tag \* \* const,int,struct mxArray\_tag \* \* const)(0, 0x00c2d830, 0, 0x00c2df98 "dâÂ") + 81 bytes  
 [24] m\_interpreter.dll:public: bool \_\_thiscall Resolver::CallMFunction(int,int,class \_m\_operand \* const,union m\_operand\_storage \*,int,class \_m\_operand \* const,union m\_operand\_storage \*,int \*)(0x00c2da78, 0, 1, 0x10d86028) + 1209 bytes  
 [25] m\_interpreter.dll:private: bool \_\_thiscall accelImpl::MFunctionCall(struct \_accelOp \* \*)(0, 0xffffffff, 0x10b50d00, 0x10dfa5d0) + 266 bytes  
 [26] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelImpl::Exec(void)(0x00c2df98 "dâÂ", 0xffffffff, 0xffffffff, 0x10dfa5d0) + 170 bytes  
 [27] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelCode::Call(enum inMarshalType \*,int \*)const (0x00c2e238, 0xffffffff, 0, 0) + 115 bytes  
 [28] m\_interpreter.dll:public: static bool \_\_cdecl inJit::ExecuteHotSegment(struct \_inJitAccelInfo \*,enum opcodes \*,int \*,int \*)(0x00c2e394, 0x00c2e4e8, 0x00c2e47c, 0x00c2e638) + 2523 bytes  
 [29] m\_interpreter.dll:int \_\_cdecl inInterp(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag volatile \*,int \*)(1, 670, 80, 0) + 826 bytes  
 [30] m\_interpreter.dll:int \_\_cdecl protected\_inInterp(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag \*,int \*)(1, 670, 57, 0) + 39 bytes  
 [31] m\_interpreter.dll:int \_\_cdecl inInterPcodeSJ(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag \*,int \*)(1, 670, 57, 0) + 251 bytes  
 [32] m\_interpreter.dll:int \_\_cdecl inExecuteMFunctionOrScript(class Mfh\_mp \*,bool)(0xffffff00, 0xffffffff, 0x10e89c70, 0) + 935 bytes  
 [33] m\_interpreter.dll:void \_\_cdecl inRunMfile(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*,class Mfh\_mp \*,struct inWorkSpace\_tag \*)(0, 0x00c2e9d0, 0, 0x00c2e940) + 466 bytes  
 [34] m\_interpreter.dll:public: virtual void \_\_thiscall Mfh\_mp::dispatch\_file(struct \_mdUnknown\_workspace \*,int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0, 0x00c2e9d0, 0) + 23 bytes  
 [35] m\_interpreter.dll:public: virtual void \_\_thiscall Mfh\_mp::dispatch\_file(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0x00c2e9d0, 0, 0x00c2e940) + 22 bytes  
 [36] m\_dispatcher.dll:public: virtual void \_\_thiscall Mfh\_file::dispatch\_fh(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0x00c2e9d0, 0, 0x00c2e940) + 204 bytes  
 [37] m\_interpreter.dll:public: void \_\_thiscall ResolverFunctionDesc::CallFunction(int,struct mxArray\_tag \* \* const,int,struct mxArray\_tag \* \* const)(0, 0x00c2e9d0, 0, 0x00c2f13c) + 81 bytes  
 [38] m\_interpreter.dll:public: bool \_\_thiscall Resolver::CallMFunction(int,int,class \_m\_operand \* const,union m\_operand\_storage \*,int,class \_m\_operand \* const,union m\_operand\_storage \*,int \*)(0x00c2ec18, 0, 1, 0x10d130e0) + 1209 bytes  
 [39] m\_interpreter.dll:private: bool \_\_thiscall accelImpl::MFunctionCall(struct \_accelOp \* \*)(0, 0xffffffff, 0x10b50f10, 0x10df6850) + 266 bytes  
 [40] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelImpl::Exec(void)(0x00c2f13c, 0xffffffff, 0xffffffff, 0x10df6850) + 170 bytes  
 [41] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelCode::Call(enum inMarshalType \*,int \*)const (0x00c2f3dc, 0x10d1e650, 0, 0) + 115 bytes  
 [42] m\_interpreter.dll:public: static bool \_\_cdecl inJit::ExecuteHotSegment(struct \_inJitAccelInfo \*,enum opcodes \*,int \*,int \*)(0x00c2f4b0, 0x00c2f488, 0x00c2f4ac, 0x00c2f4a8) + 2523 bytes  
 [43] m\_interpreter.dll:int \_\_cdecl inExecuteMFunctionOrScript(class Mfh\_mp \*,bool)(0xffffff01, 0xffffffff, 0x10e89aa8, 0) + 572 bytes  
 [44] m\_interpreter.dll:void \_\_cdecl inRunMfile(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*,class Mfh\_mp \*,struct inWorkSpace\_tag \*)(0, 0x00c2f9a0, 0, 0) + 466 bytes  
 [45] m\_interpreter.dll:public: virtual void \_\_thiscall Mfh\_mp::dispatch\_file(struct \_mdUnknown\_worksp

---

<div class="post-metadata">

**Author:** ![dfencsik](https://avatars.discourse-cdn.com/v4/letter/d/76d3ee/32.png) [@dfencsik](https://psychtoolbox.discourse.group/u/dfencsik)\
**Post date:** [October 20, 2009, 4:14pm UTC](https://psychtoolbox.discourse.group/t/basicsoundoutputdemo-segmentation-fault/1364/2 "2009-10-20T16:14:46Z")

</div>

Dear Mary,  
  
Did you try following the directions in the error message you pasted  
below? The first few lines might be helpful:  
  
 Could not find a low-latency enhanced PortAudio driver. If you need  
 really accurate sound onset timing and latency \< 30 msecs, please read  
 "help InitializePsychSound" carefully and follow the instructions.  
  
Best,  
  
David  
  

> On Tue, Oct 20, 2009 at 6:34 AM, mithagare \<[mary@...](mailto:mary@...)\> wrote:  
> \>  
> \> Hi there,  
> \>  
> \> I tried to run the BasicSoundOutputDemo on my PC running XP SP3, and it crashed Matlab with a segmentation fault. See below for output. Looking through the archives of this group, I tried to find previous messages referring to this type of problem and found this:  
> \>  
> \> [http://tech.groups.yahoo.com/group/psychtoolbox/message/7249](http://tech.groups.yahoo.com/group/psychtoolbox/message/7249)  
> \>  
> \> Following the discussion, I tried typing the following on the commandline:  
> \>  
> \> PsychPortAudio('Verbosity', 10); % To enable more debug output...  
> \> d=PsychPortAudio('GetDevices')  
> \>  
> \> The second statement caused the same crash. Any suggestions on what the problem might be? Could it be a SP3 issue?  
> \>  
> \> thanks!  
> \> Mary  
> \>  
> \> \>\> BasicSoundOutputDemo  
> \> Could not find a low-latency enhanced PortAudio driver. If you need  
> \> really accurate sound onset timing and latency \< 30 msecs, please read  
> \> "help InitializePsychSound" carefully and follow the instructions.  
> \> Will use our standard driver instead of enhanced driver...  
> \> Unknown Windows exception of type=c06d007e was not caught.  
> \> ----------------------------------------------------------  
> \> Segmentation violation detected at Tue Oct 20 09:24:39 2009  
> \> ----------------------------------------------------------  
> \>  
> \> Configuration:  
> \> MATLAB Version: 7.8.0.347 (R2009a)  
> \> MATLAB License: 2374  
> \> Operating System: Microsoft Windows XP  
> \> Window System: Version 5.1 (Build 2600: Service Pack 3)  
> \> Processor ID: x86 Family 6 Model 15 Stepping 11, GenuineIntel  
> \> Virtual Machine: Java 1.6.0\_04-b12 with Sun Microsystems Inc. Java HotSpot(TM) Client VM mixed mode  
> \> Default Encoding: windows-1252  
> \>  
> \> Fault Count: 1  
> \>  
> \> Register State:  
> \> EAX = 00c2bd28 EBX = 00000000  
> \> ECX = 00000000 EDX = 00000015  
> \> ESI = 00c2bdf0 EDI = 00000000  
> \> EBP = 00c2bd78 ESP = 00c2bd24  
> \> EIP = 7c812afb FLG = 00000202  
> \>  
> \> Stack Trace:  
> \> [0] kernel32.dll:0x7c812afb(0xc06d007e, 0, 1, 0x00c2bdec)  
> \> [1] PsychPortAudio.mexw32:0x055d4dd6(24, 0x00c2bd9c, 0x055eb22c "Open GetDeviceSettings ", 0)  
> \> [2] PsychPortAudio.mexw32:0x055d3f81(0x022a2bb8, 0, 0, 0x055eb250 "DeviceIndex")  
> \> [3] PsychPortAudio.mexw32:0x055cfdcd(0, 0, 0, 0)  
> \> [4] PsychPortAudio.mexw32:0x055c5a88(1, 0x00c2c690, 2, 0x00c2c600)  
> \> [5] libmex.dll:\_mexRunMexFile(1, 0x00c2c690, 2, 0x00c2c600) + 132 bytes  
> \> [6] libmex.dll:private: void \_\_thiscall Mfh\_mex::runMexFileWithSignalProtection(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(1, 0x00c2c690, 2, 0x00c2c600) + 73 bytes  
> \> [7] libmex.dll:public: virtual void \_\_thiscall Mfh\_mex::dispatch\_file(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(1, 0x00c2c690, 2, 0x00c2c600) + 321 bytes  
> \> [8] m\_dispatcher.dll:public: virtual void \_\_thiscall Mfh\_file::dispatch\_fh(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(1, 0x00c2c690, 2, 0x00c2c600) + 204 bytes  
> \> [9] m\_interpreter.dll:public: void \_\_thiscall ResolverFunctionDesc::CallFunction(int,struct mxArray\_tag \* \* const,int,struct mxArray\_tag \* \* const)(1, 0x00c2c690, 2, 0x00c2cdf8 "ÄÐÂ") + 81 bytes  
> \> [10] m\_interpreter.dll:public: bool \_\_thiscall Resolver::CallMFunction(int,int,class \_m\_operand \* const,union m\_operand\_storage \*,int,class \_m\_operand \* const,union m\_operand\_storage \*,int \*)(0x00c2c8d8, 1, 1, 0x10d86778) + 1209 bytes  
> \> [11] m\_interpreter.dll:private: bool \_\_thiscall accelImpl::MFunctionCall(struct \_accelOp \* \*)(0x0fa443a8, 0xffffffff, 0x10f3c4a0, 0x10f1efe0) + 266 bytes  
> \> [12] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelImpl::Exec(void)(0x00c2cdf8 "ÄÐÂ", 0xffffffff, 0xffffffff, 0x10f1efe0) + 170 bytes  
> \> [13] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelCode::Call(enum inMarshalType \*,int \*)const (0x00c2d098, 0xffffffff, 0, 0) + 115 bytes  
> \> [14] m\_interpreter.dll:public: static bool \_\_cdecl inJit::ExecuteHotSegment(struct \_inJitAccelInfo \*,enum opcodes \*,int \*,int \*)(0x00c2d1f4, 0x00c2d348, 0x00c2d2dc, 0x00c2d498) + 2523 bytes  
> \> [15] m\_interpreter.dll:int \_\_cdecl inInterp(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag volatile \*,int \*)(1, 764, 106, 0) + 826 bytes  
> \> [16] m\_interpreter.dll:int \_\_cdecl protected\_inInterp(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag \*,int \*)(1, 764, 80, 0) + 39 bytes  
> \> [17] m\_interpreter.dll:int \_\_cdecl inInterPcodeSJ(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag \*,int \*)(1, 764, 80, 0) + 251 bytes  
> \> [18] m\_interpreter.dll:int \_\_cdecl inExecuteMFunctionOrScript(class Mfh\_mp \*,bool)(0xffffff00, 0xffffffff, 0x10e8a390, 0) + 935 bytes  
> \> [19] m\_interpreter.dll:void \_\_cdecl inRunMfile(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*,class Mfh\_mp \*,struct inWorkSpace\_tag \*)(0, 0x00c2d830, 0, 0x00c2d7a0 "pØÂ") + 466 bytes  
> \> [20] m\_interpreter.dll:public: virtual void \_\_thiscall Mfh\_mp::dispatch\_file(struct \_mdUnknown\_workspace \*,int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0, 0x00c2d830, 0) + 23 bytes  
> \> [21] m\_interpreter.dll:public: virtual void \_\_thiscall Mfh\_mp::dispatch\_file(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0x00c2d830, 0, 0x00c2d7a0 "pØÂ") + 22 bytes  
> \> [22] m\_dispatcher.dll:public: virtual void \_\_thiscall Mfh\_file::dispatch\_fh(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0x00c2d830, 0, 0x00c2d7a0 "pØÂ") + 204 bytes  
> \> [23] m\_interpreter.dll:public: void \_\_thiscall ResolverFunctionDesc::CallFunction(int,struct mxArray\_tag \* \* const,int,struct mxArray\_tag \* \* const)(0, 0x00c2d830, 0, 0x00c2df98 "dâÂ") + 81 bytes  
> \> [24] m\_interpreter.dll:public: bool \_\_thiscall Resolver::CallMFunction(int,int,class \_m\_operand \* const,union m\_operand\_storage \*,int,class \_m\_operand \* const,union m\_operand\_storage \*,int \*)(0x00c2da78, 0, 1, 0x10d86028) + 1209 bytes  
> \> [25] m\_interpreter.dll:private: bool \_\_thiscall accelImpl::MFunctionCall(struct \_accelOp \* \*)(0, 0xffffffff, 0x10b50d00, 0x10dfa5d0) + 266 bytes  
> \> [26] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelImpl::Exec(void)(0x00c2df98 "dâÂ", 0xffffffff, 0xffffffff, 0x10dfa5d0) + 170 bytes  
> \> [27] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelCode::Call(enum inMarshalType \*,int \*)const (0x00c2e238, 0xffffffff, 0, 0) + 115 bytes  
> \> [28] m\_interpreter.dll:public: static bool \_\_cdecl inJit::ExecuteHotSegment(struct \_inJitAccelInfo \*,enum opcodes \*,int \*,int \*)(0x00c2e394, 0x00c2e4e8, 0x00c2e47c, 0x00c2e638) + 2523 bytes  
> \> [29] m\_interpreter.dll:int \_\_cdecl inInterp(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag volatile \*,int \*)(1, 670, 80, 0) + 826 bytes  
> \> [30] m\_interpreter.dll:int \_\_cdecl protected\_inInterp(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag \*,int \*)(1, 670, 57, 0) + 39 bytes  
> \> [31] m\_interpreter.dll:int \_\_cdecl inInterPcodeSJ(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag \*,int \*)(1, 670, 57, 0) + 251 bytes  
> \> [32] m\_interpreter.dll:int \_\_cdecl inExecuteMFunctionOrScript(class Mfh\_mp \*,bool)(0xffffff00, 0xffffffff, 0x10e89c70, 0) + 935 bytes  
> \> [33] m\_interpreter.dll:void \_\_cdecl inRunMfile(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*,class Mfh\_mp \*,struct inWorkSpace\_tag \*)(0, 0x00c2e9d0, 0, 0x00c2e940) + 466 bytes  
> \> [34] m\_interpreter.dll:public: virtual void \_\_thiscall Mfh\_mp::dispatch\_file(struct \_mdUnknown\_workspace \*,int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0, 0x00c2e9d0, 0) + 23 bytes  
> \> [35] m\_interpreter.dll:public: virtual void \_\_thiscall Mfh\_mp::dispatch\_file(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0x00c2e9d0, 0, 0x00c2e940) + 22 bytes  
> \> [36] m\_dispatcher.dll:public: virtual void \_\_thiscall Mfh\_file::dispatch\_fh(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0x00c2e9d0, 0, 0x00c2e940) + 204 bytes  
> \> [37] m\_interpreter.dll:public: void \_\_thiscall ResolverFunctionDesc::CallFunction(int,struct mxArray\_tag \* \* const,int,struct mxArray\_tag \* \* const)(0, 0x00c2e9d0, 0, 0x00c2f13c) + 81 bytes  
> \> [38] m\_interpreter.dll:public: bool \_\_thiscall Resolver::CallMFunction(int,int,class \_m\_operand \* const,union m\_operand\_storage \*,int,class \_m\_operand \* const,union m\_operand\_storage \*,int \*)(0x00c2ec18, 0, 1, 0x10d130e0) + 1209 bytes  
> \> [39] m\_interpreter.dll:private: bool \_\_thiscall accelImpl::MFunctionCall(struct \_accelOp \* \*)(0, 0xffffffff, 0x10b50f10, 0x10df6850) + 266 bytes  
> \> [40] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelImpl::Exec(void)(0x00c2f13c, 0xffffffff, 0xffffffff, 0x10df6850) + 170 bytes  
> \> [41] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelCode::Call(enum inMarshalType \*,int \*)const (0x00c2f3dc, 0x10d1e650, 0, 0) + 115 bytes  
> \> [42] m\_interpreter.dll:public: static bool \_\_cdecl inJit::ExecuteHotSegment(struct \_inJitAccelInfo \*,enum opcodes \*,int \*,int \*)(0x00c2f4b0, 0x00c2f488, 0x00c2f4ac, 0x00c2f4a8) + 2523 bytes  
> \> [43] m\_interpreter.dll:int \_\_cdecl inExecuteMFunctionOrScript(class Mfh\_mp \*,bool)(0xffffff01, 0xffffffff, 0x10e89aa8, 0) + 572 bytes  
> \> [44] m\_interpreter.dll:void \_\_cdecl inRunMfile(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*,class Mfh\_mp \*,struct inWorkSpace\_tag \*)(0, 0x00c2f9a0, 0, 0) + 466 bytes  
> \> [45] m\_interpreter.dll:public: virtual void \_\_thiscall Mfh\_mp::dispatch\_file(struct \_mdUnknown\_worksp  
> \>  
> \>

---

<div class="post-metadata">

**Author:** ![mariokleiner](https://avatars.discourse-cdn.com/v4/letter/m/13edae/32.png) [@mariokleiner](https://psychtoolbox.discourse.group/u/mariokleiner)\
**Post date:** [October 22, 2009, 5:00am UTC](https://psychtoolbox.discourse.group/t/basicsoundoutputdemo-segmentation-fault/1364/3 "2009-10-22T05:00:32Z")

</div>

No, BasicSoundOutputDemo should have worked without the low-latency driver, and usually it does, at least i'm not aware of crash problems. But then the problem is "solved" by Mary's upgrade to the low-latency plugin and this seems to be an isolated failure case, so I'll not pursue this further unless many other people report trouble.  
  
Btw. the low-latency plugin for MS-Windows by itself will not provide any low-latency or improved timing accuracy, it just gives you the option of getting these if you have a proper ASIO sound card installed.  
  
best,  
-mario  
  

> --- In [psychtoolbox@yahoogroups.com](mailto:psychtoolbox@yahoogroups.com), David Fencsik \<fencsik@...\> wrote:  
> \>  
> \> Dear Mary,  
> \>   
> \> Did you try following the directions in the error message you pasted  
> \> below? The first few lines might be helpful:  
> \>   
> \> Could not find a low-latency enhanced PortAudio driver. If you need  
> \> really accurate sound onset timing and latency \< 30 msecs, please read  
> \> "help InitializePsychSound" carefully and follow the instructions.  
> \>   
> \> Best,  
> \>   
> \> David  
> \>   
> \> On Tue, Oct 20, 2009 at 6:34 AM, mithagare \<mary@...\> wrote:  
> \> \>  
> \> \> Hi there,  
> \> \>  
> \> \> I tried to run the BasicSoundOutputDemo on my PC running XP SP3, and it crashed Matlab with a segmentation fault. See below for output. Looking through the archives of this group, I tried to find previous messages referring to this type of problem and found this:  
> \> \>  
> \> \> [http://tech.groups.yahoo.com/group/psychtoolbox/message/7249](http://tech.groups.yahoo.com/group/psychtoolbox/message/7249)  
> \> \>  
> \> \> Following the discussion, I tried typing the following on the commandline:  
> \> \>  
> \> \> PsychPortAudio('Verbosity', 10); % To enable more debug output...  
> \> \> d=PsychPortAudio('GetDevices')  
> \> \>  
> \> \> The second statement caused the same crash. Any suggestions on what the problem might be? Could it be a SP3 issue?  
> \> \>  
> \> \> thanks!  
> \> \> Mary  
> \> \>  
> \> \> \>\> BasicSoundOutputDemo  
> \> \> Could not find a low-latency enhanced PortAudio driver. If you need  
> \> \> really accurate sound onset timing and latency \< 30 msecs, please read  
> \> \> "help InitializePsychSound" carefully and follow the instructions.  
> \> \> Will use our standard driver instead of enhanced driver...  
> \> \> Unknown Windows exception of type=c06d007e was not caught.  
> \> \> ----------------------------------------------------------  
> \> \> Segmentation violation detected at Tue Oct 20 09:24:39 2009  
> \> \> ----------------------------------------------------------  
> \> \>  
> \> \> Configuration:  
> \> \> MATLAB Version: 7.8.0.347 (R2009a)  
> \> \> MATLAB License: 2374  
> \> \> Operating System: Microsoft Windows XP  
> \> \> Window System: Version 5.1 (Build 2600: Service Pack 3)  
> \> \> Processor ID: x86 Family 6 Model 15 Stepping 11, GenuineIntel  
> \> \> Virtual Machine: Java 1.6.0\_04-b12 with Sun Microsystems Inc. Java HotSpot(TM) Client VM mixed mode  
> \> \> Default Encoding: windows-1252  
> \> \>  
> \> \> Fault Count: 1  
> \> \>  
> \> \> Register State:  
> \> \> EAX = 00c2bd28 EBX = 00000000  
> \> \> ECX = 00000000 EDX = 00000015  
> \> \> ESI = 00c2bdf0 EDI = 00000000  
> \> \> EBP = 00c2bd78 ESP = 00c2bd24  
> \> \> EIP = 7c812afb FLG = 00000202  
> \> \>  
> \> \> Stack Trace:  
> \> \> [0] kernel32.dll:0x7c812afb(0xc06d007e, 0, 1, 0x00c2bdec)  
> \> \> [1] PsychPortAudio.mexw32:0x055d4dd6(24, 0x00c2bd9c, 0x055eb22c "Open GetDeviceSettings ", 0)  
> \> \> [2] PsychPortAudio.mexw32:0x055d3f81(0x022a2bb8, 0, 0, 0x055eb250 "DeviceIndex")  
> \> \> [3] PsychPortAudio.mexw32:0x055cfdcd(0, 0, 0, 0)  
> \> \> [4] PsychPortAudio.mexw32:0x055c5a88(1, 0x00c2c690, 2, 0x00c2c600)  
> \> \> [5] libmex.dll:\_mexRunMexFile(1, 0x00c2c690, 2, 0x00c2c600) + 132 bytes  
> \> \> [6] libmex.dll:private: void \_\_thiscall Mfh\_mex::runMexFileWithSignalProtection(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(1, 0x00c2c690, 2, 0x00c2c600) + 73 bytes  
> \> \> [7] libmex.dll:public: virtual void \_\_thiscall Mfh\_mex::dispatch\_file(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(1, 0x00c2c690, 2, 0x00c2c600) + 321 bytes  
> \> \> [8] m\_dispatcher.dll:public: virtual void \_\_thiscall Mfh\_file::dispatch\_fh(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(1, 0x00c2c690, 2, 0x00c2c600) + 204 bytes  
> \> \> [9] m\_interpreter.dll:public: void \_\_thiscall ResolverFunctionDesc::CallFunction(int,struct mxArray\_tag \* \* const,int,struct mxArray\_tag \* \* const)(1, 0x00c2c690, 2, 0x00c2cdf8 "ÄÐÂ") + 81 bytes  
> \> \> [10] m\_interpreter.dll:public: bool \_\_thiscall Resolver::CallMFunction(int,int,class \_m\_operand \* const,union m\_operand\_storage \*,int,class \_m\_operand \* const,union m\_operand\_storage \*,int \*)(0x00c2c8d8, 1, 1, 0x10d86778) + 1209 bytes  
> \> \> [11] m\_interpreter.dll:private: bool \_\_thiscall accelImpl::MFunctionCall(struct \_accelOp \* \*)(0x0fa443a8, 0xffffffff, 0x10f3c4a0, 0x10f1efe0) + 266 bytes  
> \> \> [12] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelImpl::Exec(void)(0x00c2cdf8 "ÄÐÂ", 0xffffffff, 0xffffffff, 0x10f1efe0) + 170 bytes  
> \> \> [13] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelCode::Call(enum inMarshalType \*,int \*)const (0x00c2d098, 0xffffffff, 0, 0) + 115 bytes  
> \> \> [14] m\_interpreter.dll:public: static bool \_\_cdecl inJit::ExecuteHotSegment(struct \_inJitAccelInfo \*,enum opcodes \*,int \*,int \*)(0x00c2d1f4, 0x00c2d348, 0x00c2d2dc, 0x00c2d498) + 2523 bytes  
> \> \> [15] m\_interpreter.dll:int \_\_cdecl inInterp(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag volatile \*,int \*)(1, 764, 106, 0) + 826 bytes  
> \> \> [16] m\_interpreter.dll:int \_\_cdecl protected\_inInterp(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag \*,int \*)(1, 764, 80, 0) + 39 bytes  
> \> \> [17] m\_interpreter.dll:int \_\_cdecl inInterPcodeSJ(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag \*,int \*)(1, 764, 80, 0) + 251 bytes  
> \> \> [18] m\_interpreter.dll:int \_\_cdecl inExecuteMFunctionOrScript(class Mfh\_mp \*,bool)(0xffffff00, 0xffffffff, 0x10e8a390, 0) + 935 bytes  
> \> \> [19] m\_interpreter.dll:void \_\_cdecl inRunMfile(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*,class Mfh\_mp \*,struct inWorkSpace\_tag \*)(0, 0x00c2d830, 0, 0x00c2d7a0 "pØÂ") + 466 bytes  
> \> \> [20] m\_interpreter.dll:public: virtual void \_\_thiscall Mfh\_mp::dispatch\_file(struct \_mdUnknown\_workspace \*,int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0, 0x00c2d830, 0) + 23 bytes  
> \> \> [21] m\_interpreter.dll:public: virtual void \_\_thiscall Mfh\_mp::dispatch\_file(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0x00c2d830, 0, 0x00c2d7a0 "pØÂ") + 22 bytes  
> \> \> [22] m\_dispatcher.dll:public: virtual void \_\_thiscall Mfh\_file::dispatch\_fh(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0x00c2d830, 0, 0x00c2d7a0 "pØÂ") + 204 bytes  
> \> \> [23] m\_interpreter.dll:public: void \_\_thiscall ResolverFunctionDesc::CallFunction(int,struct mxArray\_tag \* \* const,int,struct mxArray\_tag \* \* const)(0, 0x00c2d830, 0, 0x00c2df98 "dâÂ") + 81 bytes  
> \> \> [24] m\_interpreter.dll:public: bool \_\_thiscall Resolver::CallMFunction(int,int,class \_m\_operand \* const,union m\_operand\_storage \*,int,class \_m\_operand \* const,union m\_operand\_storage \*,int \*)(0x00c2da78, 0, 1, 0x10d86028) + 1209 bytes  
> \> \> [25] m\_interpreter.dll:private: bool \_\_thiscall accelImpl::MFunctionCall(struct \_accelOp \* \*)(0, 0xffffffff, 0x10b50d00, 0x10dfa5d0) + 266 bytes  
> \> \> [26] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelImpl::Exec(void)(0x00c2df98 "dâÂ", 0xffffffff, 0xffffffff, 0x10dfa5d0) + 170 bytes  
> \> \> [27] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelCode::Call(enum inMarshalType \*,int \*)const (0x00c2e238, 0xffffffff, 0, 0) + 115 bytes  
> \> \> [28] m\_interpreter.dll:public: static bool \_\_cdecl inJit::ExecuteHotSegment(struct \_inJitAccelInfo \*,enum opcodes \*,int \*,int \*)(0x00c2e394, 0x00c2e4e8, 0x00c2e47c, 0x00c2e638) + 2523 bytes  
> \> \> [29] m\_interpreter.dll:int \_\_cdecl inInterp(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag volatile \*,int \*)(1, 670, 80, 0) + 826 bytes  
> \> \> [30] m\_interpreter.dll:int \_\_cdecl protected\_inInterp(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag \*,int \*)(1, 670, 57, 0) + 39 bytes  
> \> \> [31] m\_interpreter.dll:int \_\_cdecl inInterPcodeSJ(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag \*,int \*)(1, 670, 57, 0) + 251 bytes  
> \> \> [32] m\_interpreter.dll:int \_\_cdecl inExecuteMFunctionOrScript(class Mfh\_mp \*,bool)(0xffffff00, 0xffffffff, 0x10e89c70, 0) + 935 bytes  
> \> \> [33] m\_interpreter.dll:void \_\_cdecl inRunMfile(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*,class Mfh\_mp \*,struct inWorkSpace\_tag \*)(0, 0x00c2e9d0, 0, 0x00c2e940) + 466 bytes  
> \> \> [34] m\_interpreter.dll:public: virtual void \_\_thiscall Mfh\_mp::dispatch\_file(struct \_mdUnknown\_workspace \*,int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0, 0x00c2e9d0, 0) + 23 bytes  
> \> \> [35] m\_interpreter.dll:public: virtual void \_\_thiscall Mfh\_mp::dispatch\_file(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0x00c2e9d0, 0, 0x00c2e940) + 22 bytes  
> \> \> [36] m\_dispatcher.dll:public: virtual void \_\_thiscall Mfh\_file::dispatch\_fh(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0x00c2e9d0, 0, 0x00c2e940) + 204 bytes  
> \> \> [37] m\_interpreter.dll:public: void \_\_thiscall ResolverFunctionDesc::CallFunction(int,struct mxArray\_tag \* \* const,int,struct mxArray\_tag \* \* const)(0, 0x00c2e9d0, 0, 0x00c2f13c) + 81 bytes  
> \> \> [38] m\_interpreter.dll:public: bool \_\_thiscall Resolver::CallMFunction(int,int,class \_m\_operand \* const,union m\_operand\_storage \*,int,class \_m\_operand \* const,union m\_operand\_storage \*,int \*)(0x00c2ec18, 0, 1, 0x10d130e0) + 1209 bytes  
> \> \> [39] m\_interpreter.dll:private: bool \_\_thiscall accelImpl::MFunctionCall(struct \_accelOp \* \*)(0, 0xffffffff, 0x10b50f10, 0x10df6850) + 266 bytes  
> \> \> [40] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelImpl::Exec(void)(0x00c2f13c, 0xffffffff, 0xffffffff, 0x10df6850) + 170 bytes  
> \> \> [41] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelCode::Call(enum inMarshalType \*,int \*)const (0x00c2f3dc, 0x10d1e650, 0, 0) + 115 bytes  
> \> \> [42] m\_interpreter.dll:public: static bool \_\_cdecl inJit::ExecuteHotSegment(struct \_inJitAccelInfo \*,enum opcodes \*,int \*,int \*)(0x00c2f4b0, 0x00c2f488, 0x00c2f4ac, 0x00c2f4a8) + 2523 bytes  
> \> \> [43] m\_interpreter.dll:int \_\_cdecl inExecuteMFunctionOrScript(class Mfh\_mp \*,bool)(0xffffff01, 0xffffffff, 0x10e89aa8, 0) + 572 bytes  
> \> \> [44] m\_interpreter.dll:void \_\_cdecl inRunMfile(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*,class Mfh\_mp \*,struct inWorkSpace\_tag \*)(0, 0x00c2f9a0, 0, 0) + 466 bytes  
> \> \> [45] m\_interpreter.dll:public: virtual void \_\_thiscall Mfh\_mp::dispatch\_file(struct \_mdUnknown\_worksp  
> \> \>  
> \> \>  
> \>

---

<div class="post-metadata">

**Author:** ![mariokleiner](https://avatars.discourse-cdn.com/v4/letter/m/13edae/32.png) [@mariokleiner](https://psychtoolbox.discourse.group/u/mariokleiner)\
**Post date:** [January 26, 2011, 11:28pm UTC](https://psychtoolbox.discourse.group/t/basicsoundoutputdemo-segmentation-fault/1364/4 "2011-01-26T23:28:38Z")

</div>

--- In [psychtoolbox@yahoogroups.com](mailto:psychtoolbox@yahoogroups.com), "abreuery" \<atbreuer@...\> wrote:  

> \>  
> \> Hi,  
> \>   
> \> I get an error message very similar to Mary's. When I type in:  
> \> devices = PsychPortAudio('GetDevices') or  
> \> devices = PsychPortAudio('GetDevices',3)  
> \>   
> \> I get the long error message I've pasted below, asking me to restart. I assume it may be related to the fact that there is no low latency device in my computer.  
> \>

You have to call InitializePsychSound before calling any PsychPortAudio function on Windows, otherwise bad things may happen.  
  

> \> Also, a partly related question, and please excuse me for what seems like an obvious question, when I type in the GetDevices command on similar PC we have, it returns the 1x8 struct:

Look into devices(1), devices(2) etc. for the actual content.  
  

> \> DeviceIndex  
> \> HostAudioAPIId  
> \> HostAudioAPIName  
> \> DeviceName  
> \> NrInputChannels  
> \> NrOutputChannels  
> \> LowInputLatency  
> \> HighInputLatency  
> \> LowOutputLatency  
> \> HighOutputLatency  
> \> DefaultSampleRate  
> \>   
> \> I'm not quite sure what to make of this. Does it indicate whether this second computer has a low latency device?  
> \>

If the devices = PsychPortAudio('GetDevices',3) call gives you anything back, you have some ASIO hardware installed, which is as low-latency as it gets. If you don't have the relevant asio plugin from our wiki installed, or no ASIO soundcard, it won't work.  
  
Also, InitializePsychSound will already print out if you have asio support or not.  
  
best,  
-mario  
  

> \> Thanks for any help.  
> \>   
> \> Andreas  
> \> Action and Cognition Lab  
> \> University of Victoria  
> \>   
> \> And here's the error message:  
> \>   
> \> Unknown Windows exception of type=c06d007e was not caught.  
> \> ------------------------------------------------------------------------  
> \> Segmentation violation detected at Tue Jan 25 09:09:32 2011  
> \> ------------------------------------------------------------------------  
> \>   
> \> Configuration:  
> \> MATLAB Version: 7.1.0.246 (R14) Service Pack 3  
> \> MATLAB License: 292797  
> \> Operating System: Microsoft Windows XP  
> \> Window System: Version 5.1 (Build 2600: Service Pack 3)  
> \> Processor ID: x86 Family 15 Model 2 Stepping 9, GenuineIntel  
> \> Virtual Machine: Java 1.5.0 with Sun Microsystems Inc. Java HotSpot(TM) Client VM mixed mode  
> \> Default Charset: windows-1252  
> \>   
> \> Register State:  
> \> EAX = 00cddcc8 EBX = 00000000  
> \> ECX = 00000000 EDX = 00000000  
> \> ESI = 00cddd70 EDI = 00000000  
> \> EBP = 00cddd18 ESP = 00cddcc4  
> \> EIP = 7c812afb FLG = 00000202  
> \>   
> \> Stack Trace:  
> \> [0] kernel32.dll:0x7c812afb(0xc06d007e, 0, 1, 0x00cddd6c "\<ÝÍ")  
> \> [1] PsychPortAudio.dll:0x0f39da45(24, 0x00cddd3c, 0x0f3af7a4 "Open GetDeviceSettings ", 0x0f3af1e8 "Returns 'devices', an array of s..")  
> \> [2] PsychPortAudio.dll:0x0f393844(2487376, 0x00cdddc4, 0, 0x00cdddc8)  
> \> [3] PsychPortAudio.dll:0x0f3915fd(0, 0, 0, 0)  
> \> [4] PsychPortAudio.dll:0x0f384a64(1, 0x00cde660, 1, 0x00cde6c0)  
> \> [5] libmex.dll:\_mexRunMexFile(1, 0x00cde660, 1, 0x00cde6c0) + 103 bytes  
> \> [6] libmex.dll:private: void \_\_thiscall Mfh\_mex::runMexFileWithSignalProtection(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(1, 0x00cde660, 1, 0x00cde6c0) + 73 bytes  
> \> [7] libmex.dll:public: virtual void \_\_thiscall Mfh\_mex::dispatch\_file(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(1, 0x00cde660, 1, 0x00cde6c0) + 169 bytes  
> \> [8] m\_dispatcher.dll:public: virtual void \_\_thiscall Mfh\_file::dispatch\_fh(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(1, 0x00cde660, 1, 0x00cde6c0) + 271 bytes  
> \> [9] m\_interpreter.dll:int \_\_cdecl mdDispatch(int,char const \*,int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*,class Mfh\_MATLAB\_fn \* \*)(481, 0x0f177818 "PsychPortAudio", 1, 0x00cde660) + 88 bytes  
> \> [10] m\_interpreter.dll:\_inDispatchFromStack(481, 0x0f177818 "PsychPortAudio", 1, 1) + 800 bytes  
> \> [11] m\_interpreter.dll:enum opcodes \_\_cdecl inDispatchCall(char const \*,int,int,int,int \*,int \*)(0x0f177818 "PsychPortAudio", 481, 1, 1) + 145 bytes  
> \> [12] m\_interpreter.dll:int \_\_cdecl inInterp(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag volatile \*,int \*)(2, 0, 0, 0) + 2534 bytes  
> \> [13] m\_interpreter.dll:int \_\_cdecl inInterPcodeSJ(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag \*,int \*)(2, 0, 0, 0) + 282 bytes  
> \> [14] m\_interpreter.dll:\_inInterPcode(2, 0x784d6e7c, 0, 0) + 81 bytes  
> \> [15] m\_interpreter.dll:enum inExecutionStatus \_\_cdecl in\_local\_call\_eval\_function(int \*,struct \_pcodeheader \*,int \*,struct mxArray\_tag \* \* const,enum inDebugCheck)(0x00cdf278, 0x00cdf370, 2, 1) + 153 bytes  
> \> [16] m\_interpreter.dll:$L74683(0x784d6e7c, 0x0f293320 "devices = PsychPortAudio('GetDev..", 0, 0) + 184 bytes  
> \> [17] m\_interpreter.dll:enum inExecutionStatus \_\_cdecl inEvalCmdWithLocalReturnandtype(char const \*,int \*,enum inDebugCheck)(0x0f293320 "devices = PsychPortAudio('GetDev..", 0, 2, 0x00cdf3bc "DôÍ") + 69 bytes  
> \> [18] m\_interpreter.dll:\_inEvalCmdNoEnd(0x0f293320 "devices = PsychPortAudio('GetDev..", 1, 255, 0) + 16 bytes  
> \> [19] bridge.dll:enum inExecutionStatus \_\_cdecl ThrowSignal(char const \*)(0x0f293320 "devices = PsychPortAudio('GetDev..", 0x7c80b741, 0x012074a8, 0x012074a8) + 60 bytes  
> \> [20] bridge.dll:$L86781(0, 0, 0x784d6e58, 0x7c36b71f) + 432 bytes  
> \> [21] mcr.dll:public: void \_\_thiscall mcrInstance::mnParser(void)(271289, 0x505c3a43, 0x72676f72, 0x46206d61) + 93 bytes  
> \> [22] MATLAB.exe:0x00401ca9(4194304, 0, 271289, 0x012074a8)  
> \> [23] MATLAB.exe:0x00403d9f(0x00ead0b8, 24, 0x7ffdf000, 0xb6f7dce8)  
> \> [24] kernel32.dll:0x7c817077(0x00403c1a, 0, 0, 0)  
> \>   
> \> This error was detected while a MEX-file was running. If the MEX-file  
> \> is not an official MathWorks function, please examine its source code  
> \> for errors. Please consult the External Interfaces Guide for information  
> \> on debugging MEX-files.  
> \>   
> \> If it is an official MathWorks function, please  
> \> follow these steps in reporting this problem to The MathWorks so  
> \> that we have the best chance of correcting it:  
> \>   
> \> 1. Send this crash report to segv@... for automated analysis.  
> \> For your convenience, this information has been recorded in:  
> \> C:\DOCUME~1\Admin\LOCALS~1\Temp\matlab\_crash\_dump.3552  
> \>   
> \> 2. Also, if the problem is reproducible, send the crash report to  
> \> support@... along with:  
> \> - A specific list of steps that will reproduce the problem  
> \> - Any M, MEX, MDL or other files required to reproduce the problem  
> \> - Any error messages displayed to the command window  
> \> A technical support engineer will contact you with further information.  
> \>   
> \> Thank you for your assistance. Please save your workspace and restart  
> \> MATLAB before continuing your work.  
> \>   
> \>   
> \>   
> \>   
> \> --- In [psychtoolbox@yahoogroups.com](mailto:psychtoolbox@yahoogroups.com), "Mario" \<mario.kleiner@\> wrote:  
> \> \>  
> \> \> No, BasicSoundOutputDemo should have worked without the low-latency driver, and usually it does, at least i'm not aware of crash problems. But then the problem is "solved" by Mary's upgrade to the low-latency plugin and this seems to be an isolated failure case, so I'll not pursue this further unless many other people report trouble.  
> \> \>   
> \> \> Btw. the low-latency plugin for MS-Windows by itself will not provide any low-latency or improved timing accuracy, it just gives you the option of getting these if you have a proper ASIO sound card installed.  
> \> \>   
> \> \> best,  
> \> \> -mario  
> \> \>   
> \> \> --- In [psychtoolbox@yahoogroups.com](mailto:psychtoolbox@yahoogroups.com), David Fencsik \<fencsik@\> wrote:  
> \> \> \>  
> \> \> \> Dear Mary,  
> \> \> \>   
> \> \> \> Did you try following the directions in the error message you pasted  
> \> \> \> below? The first few lines might be helpful:  
> \> \> \>   
> \> \> \> Could not find a low-latency enhanced PortAudio driver. If you need  
> \> \> \> really accurate sound onset timing and latency \< 30 msecs, please read  
> \> \> \> "help InitializePsychSound" carefully and follow the instructions.  
> \> \> \>   
> \> \> \> Best,  
> \> \> \>   
> \> \> \> David  
> \> \> \>   
> \> \> \> On Tue, Oct 20, 2009 at 6:34 AM, mithagare \<mary@\> wrote:  
> \> \> \> \>  
> \> \> \> \> Hi there,  
> \> \> \> \>  
> \> \> \> \> I tried to run the BasicSoundOutputDemo on my PC running XP SP3, and it crashed Matlab with a segmentation fault. See below for output. Looking through the archives of this group, I tried to find previous messages referring to this type of problem and found this:  
> \> \> \> \>  
> \> \> \> \> [http://tech.groups.yahoo.com/group/psychtoolbox/message/7249](http://tech.groups.yahoo.com/group/psychtoolbox/message/7249)  
> \> \> \> \>  
> \> \> \> \> Following the discussion, I tried typing the following on the commandline:  
> \> \> \> \>  
> \> \> \> \> PsychPortAudio('Verbosity', 10); % To enable more debug output...  
> \> \> \> \> d=PsychPortAudio('GetDevices')  
> \> \> \> \>  
> \> \> \> \> The second statement caused the same crash. Any suggestions on what the problem might be? Could it be a SP3 issue?  
> \> \> \> \>  
> \> \> \> \> thanks!  
> \> \> \> \> Mary  
> \> \> \> \>  
> \> \> \> \> \>\> BasicSoundOutputDemo  
> \> \> \> \> Could not find a low-latency enhanced PortAudio driver. If you need  
> \> \> \> \> really accurate sound onset timing and latency \< 30 msecs, please read  
> \> \> \> \> "help InitializePsychSound" carefully and follow the instructions.  
> \> \> \> \> Will use our standard driver instead of enhanced driver...  
> \> \> \> \> Unknown Windows exception of type=c06d007e was not caught.  
> \> \> \> \> ----------------------------------------------------------  
> \> \> \> \> Segmentation violation detected at Tue Oct 20 09:24:39 2009  
> \> \> \> \> ----------------------------------------------------------  
> \> \> \> \>  
> \> \> \> \> Configuration:  
> \> \> \> \> MATLAB Version: 7.8.0.347 (R2009a)  
> \> \> \> \> MATLAB License: 2374  
> \> \> \> \> Operating System: Microsoft Windows XP  
> \> \> \> \> Window System: Version 5.1 (Build 2600: Service Pack 3)  
> \> \> \> \> Processor ID: x86 Family 6 Model 15 Stepping 11, GenuineIntel  
> \> \> \> \> Virtual Machine: Java 1.6.0\_04-b12 with Sun Microsystems Inc. Java HotSpot(TM) Client VM mixed mode  
> \> \> \> \> Default Encoding: windows-1252  
> \> \> \> \>  
> \> \> \> \> Fault Count: 1  
> \> \> \> \>  
> \> \> \> \> Register State:  
> \> \> \> \> EAX = 00c2bd28 EBX = 00000000  
> \> \> \> \> ECX = 00000000 EDX = 00000015  
> \> \> \> \> ESI = 00c2bdf0 EDI = 00000000  
> \> \> \> \> EBP = 00c2bd78 ESP = 00c2bd24  
> \> \> \> \> EIP = 7c812afb FLG = 00000202  
> \> \> \> \>  
> \> \> \> \> Stack Trace:  
> \> \> \> \> [0] kernel32.dll:0x7c812afb(0xc06d007e, 0, 1, 0x00c2bdec)  
> \> \> \> \> [1] PsychPortAudio.mexw32:0x055d4dd6(24, 0x00c2bd9c, 0x055eb22c "Open GetDeviceSettings ", 0)  
> \> \> \> \> [2] PsychPortAudio.mexw32:0x055d3f81(0x022a2bb8, 0, 0, 0x055eb250 "DeviceIndex")  
> \> \> \> \> [3] PsychPortAudio.mexw32:0x055cfdcd(0, 0, 0, 0)  
> \> \> \> \> [4] PsychPortAudio.mexw32:0x055c5a88(1, 0x00c2c690, 2, 0x00c2c600)  
> \> \> \> \> [5] libmex.dll:\_mexRunMexFile(1, 0x00c2c690, 2, 0x00c2c600) + 132 bytes  
> \> \> \> \> [6] libmex.dll:private: void \_\_thiscall Mfh\_mex::runMexFileWithSignalProtection(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(1, 0x00c2c690, 2, 0x00c2c600) + 73 bytes  
> \> \> \> \> [7] libmex.dll:public: virtual void \_\_thiscall Mfh\_mex::dispatch\_file(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(1, 0x00c2c690, 2, 0x00c2c600) + 321 bytes  
> \> \> \> \> [8] m\_dispatcher.dll:public: virtual void \_\_thiscall Mfh\_file::dispatch\_fh(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(1, 0x00c2c690, 2, 0x00c2c600) + 204 bytes  
> \> \> \> \> [9] m\_interpreter.dll:public: void \_\_thiscall ResolverFunctionDesc::CallFunction(int,struct mxArray\_tag \* \* const,int,struct mxArray\_tag \* \* const)(1, 0x00c2c690, 2, 0x00c2cdf8 "ÄÐÂ") + 81 bytes  
> \> \> \> \> [10] m\_interpreter.dll:public: bool \_\_thiscall Resolver::CallMFunction(int,int,class \_m\_operand \* const,union m\_operand\_storage \*,int,class \_m\_operand \* const,union m\_operand\_storage \*,int \*)(0x00c2c8d8, 1, 1, 0x10d86778) + 1209 bytes  
> \> \> \> \> [11] m\_interpreter.dll:private: bool \_\_thiscall accelImpl::MFunctionCall(struct \_accelOp \* \*)(0x0fa443a8, 0xffffffff, 0x10f3c4a0, 0x10f1efe0) + 266 bytes  
> \> \> \> \> [12] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelImpl::Exec(void)(0x00c2cdf8 "ÄÐÂ", 0xffffffff, 0xffffffff, 0x10f1efe0) + 170 bytes  
> \> \> \> \> [13] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelCode::Call(enum inMarshalType \*,int \*)const (0x00c2d098, 0xffffffff, 0, 0) + 115 bytes  
> \> \> \> \> [14] m\_interpreter.dll:public: static bool \_\_cdecl inJit::ExecuteHotSegment(struct \_inJitAccelInfo \*,enum opcodes \*,int \*,int \*)(0x00c2d1f4, 0x00c2d348, 0x00c2d2dc, 0x00c2d498) + 2523 bytes  
> \> \> \> \> [15] m\_interpreter.dll:int \_\_cdecl inInterp(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag volatile \*,int \*)(1, 764, 106, 0) + 826 bytes  
> \> \> \> \> [16] m\_interpreter.dll:int \_\_cdecl protected\_inInterp(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag \*,int \*)(1, 764, 80, 0) + 39 bytes  
> \> \> \> \> [17] m\_interpreter.dll:int \_\_cdecl inInterPcodeSJ(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag \*,int \*)(1, 764, 80, 0) + 251 bytes  
> \> \> \> \> [18] m\_interpreter.dll:int \_\_cdecl inExecuteMFunctionOrScript(class Mfh\_mp \*,bool)(0xffffff00, 0xffffffff, 0x10e8a390, 0) + 935 bytes  
> \> \> \> \> [19] m\_interpreter.dll:void \_\_cdecl inRunMfile(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*,class Mfh\_mp \*,struct inWorkSpace\_tag \*)(0, 0x00c2d830, 0, 0x00c2d7a0 "pØÂ") + 466 bytes  
> \> \> \> \> [20] m\_interpreter.dll:public: virtual void \_\_thiscall Mfh\_mp::dispatch\_file(struct \_mdUnknown\_workspace \*,int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0, 0x00c2d830, 0) + 23 bytes  
> \> \> \> \> [21] m\_interpreter.dll:public: virtual void \_\_thiscall Mfh\_mp::dispatch\_file(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0x00c2d830, 0, 0x00c2d7a0 "pØÂ") + 22 bytes  
> \> \> \> \> [22] m\_dispatcher.dll:public: virtual void \_\_thiscall Mfh\_file::dispatch\_fh(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0x00c2d830, 0, 0x00c2d7a0 "pØÂ") + 204 bytes  
> \> \> \> \> [23] m\_interpreter.dll:public: void \_\_thiscall ResolverFunctionDesc::CallFunction(int,struct mxArray\_tag \* \* const,int,struct mxArray\_tag \* \* const)(0, 0x00c2d830, 0, 0x00c2df98 "dâÂ") + 81 bytes  
> \> \> \> \> [24] m\_interpreter.dll:public: bool \_\_thiscall Resolver::CallMFunction(int,int,class \_m\_operand \* const,union m\_operand\_storage \*,int,class \_m\_operand \* const,union m\_operand\_storage \*,int \*)(0x00c2da78, 0, 1, 0x10d86028) + 1209 bytes  
> \> \> \> \> [25] m\_interpreter.dll:private: bool \_\_thiscall accelImpl::MFunctionCall(struct \_accelOp \* \*)(0, 0xffffffff, 0x10b50d00, 0x10dfa5d0) + 266 bytes  
> \> \> \> \> [26] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelImpl::Exec(void)(0x00c2df98 "dâÂ", 0xffffffff, 0xffffffff, 0x10dfa5d0) + 170 bytes  
> \> \> \> \> [27] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelCode::Call(enum inMarshalType \*,int \*)const (0x00c2e238, 0xffffffff, 0, 0) + 115 bytes  
> \> \> \> \> [28] m\_interpreter.dll:public: static bool \_\_cdecl inJit::ExecuteHotSegment(struct \_inJitAccelInfo \*,enum opcodes \*,int \*,int \*)(0x00c2e394, 0x00c2e4e8, 0x00c2e47c, 0x00c2e638) + 2523 bytes  
> \> \> \> \> [29] m\_interpreter.dll:int \_\_cdecl inInterp(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag volatile \*,int \*)(1, 670, 80, 0) + 826 bytes  
> \> \> \> \> [30] m\_interpreter.dll:int \_\_cdecl protected\_inInterp(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag \*,int \*)(1, 670, 57, 0) + 39 bytes  
> \> \> \> \> [31] m\_interpreter.dll:int \_\_cdecl inInterPcodeSJ(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag \*,int \*)(1, 670, 57, 0) + 251 bytes  
> \> \> \> \> [32] m\_interpreter.dll:int \_\_cdecl inExecuteMFunctionOrScript(class Mfh\_mp \*,bool)(0xffffff00, 0xffffffff, 0x10e89c70, 0) + 935 bytes  
> \> \> \> \> [33] m\_interpreter.dll:void \_\_cdecl inRunMfile(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*,class Mfh\_mp \*,struct inWorkSpace\_tag \*)(0, 0x00c2e9d0, 0, 0x00c2e940) + 466 bytes  
> \> \> \> \> [34] m\_interpreter.dll:public: virtual void \_\_thiscall Mfh\_mp::dispatch\_file(struct \_mdUnknown\_workspace \*,int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0, 0x00c2e9d0, 0) + 23 bytes  
> \> \> \> \> [35] m\_interpreter.dll:public: virtual void \_\_thiscall Mfh\_mp::dispatch\_file(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0x00c2e9d0, 0, 0x00c2e940) + 22 bytes  
> \> \> \> \> [36] m\_dispatcher.dll:public: virtual void \_\_thiscall Mfh\_file::dispatch\_fh(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0x00c2e9d0, 0, 0x00c2e940) + 204 bytes  
> \> \> \> \> [37] m\_interpreter.dll:public: void \_\_thiscall ResolverFunctionDesc::CallFunction(int,struct mxArray\_tag \* \* const,int,struct mxArray\_tag \* \* const)(0, 0x00c2e9d0, 0, 0x00c2f13c) + 81 bytes  
> \> \> \> \> [38] m\_interpreter.dll:public: bool \_\_thiscall Resolver::CallMFunction(int,int,class \_m\_operand \* const,union m\_operand\_storage \*,int,class \_m\_operand \* const,union m\_operand\_storage \*,int \*)(0x00c2ec18, 0, 1, 0x10d130e0) + 1209 bytes  
> \> \> \> \> [39] m\_interpreter.dll:private: bool \_\_thiscall accelImpl::MFunctionCall(struct \_accelOp \* \*)(0, 0xffffffff, 0x10b50f10, 0x10df6850) + 266 bytes  
> \> \> \> \> [40] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelImpl::Exec(void)(0x00c2f13c, 0xffffffff, 0xffffffff, 0x10df6850) + 170 bytes  
> \> \> \> \> [41] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelCode::Call(enum inMarshalType \*,int \*)const (0x00c2f3dc, 0x10d1e650, 0, 0) + 115 bytes  
> \> \> \> \> [42] m\_interpreter.dll:public: static bool \_\_cdecl inJit::ExecuteHotSegment(struct \_inJitAccelInfo \*,enum opcodes \*,int \*,int \*)(0x00c2f4b0, 0x00c2f488, 0x00c2f4ac, 0x00c2f4a8) + 2523 bytes  
> \> \> \> \> [43] m\_interpreter.dll:int \_\_cdecl inExecuteMFunctionOrScript(class Mfh\_mp \*,bool)(0xffffff01, 0xffffffff, 0x10e89aa8, 0) + 572 bytes  
> \> \> \> \> [44] m\_interpreter.dll:void \_\_cdecl inRunMfile(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*,class Mfh\_mp \*,struct inWorkSpace\_tag \*)(0, 0x00c2f9a0, 0, 0) + 466 bytes  
> \> \> \> \> [45] m\_interpreter.dll:public: virtual void \_\_thiscall Mfh\_mp::dispatch\_file(struct \_mdUnknown\_worksp  
> \> \> \> \>  
> \> \> \> \>  
> \> \> \>  
> \> \>  
> \>

---

<div class="post-metadata">

**Author:** ![Allen\_Ingling](https://avatars.discourse-cdn.com/v4/letter/a/a183cd/32.png) [@Allen\_Ingling](https://psychtoolbox.discourse.group/u/Allen_Ingling)\
**Post date:** [January 27, 2011, 9:04pm UTC](https://psychtoolbox.discourse.group/t/basicsoundoutputdemo-segmentation-fault/1364/5 "2011-01-27T21:04:20Z")

</div>

Thanks, Mario!  
  
Yes, there appears to be no low-latency device.  
  
However, we installed a non-ASIO supported sound card we had (Creative Labs CT-4750) and ran PsychPortAudioTimingTest on it with the photo-diode, microphone, and oscilloscope. As luck would have it, apparently the timing is much better than we expected. The sound playback was consistently delayed only one refresh cycle (60Hz setting) after onset of the black-white screen transition.  
  
I was considered accommodating this bias in my MATLAB code but could this value (16ms) be inputted into 'biasSecs' in PsychPortAudio('LatencyBias',pahandle [,biasSecs])?  
  
The issue is that we want to place an ERP marker as close to the sound onset as possible in the following way:  
  
 t = PsychPortAudio('Start', pahandle, repetitions, 0, 1);  
 putvalue(dio,ERPauditory); %\*\*\*\*\*\*\*\*\*\*\*\*ERP MARKER  
  
If I put the 16ms bias into the LatencyBias, will my ERP marker be as close as possible to the actual sound onset?  
  
Perhaps I can set the 'when' argument in PsychPortAudio('Start'...) to 16ms before the ERP marker.  
  
Thanks for any help!  
Andreas  
  
  

> --- In [psychtoolbox@yahoogroups.com](mailto:psychtoolbox@yahoogroups.com), "Mario" \<mario.kleiner@...\> wrote:  
> \>  
> \> --- In [psychtoolbox@yahoogroups.com](mailto:psychtoolbox@yahoogroups.com), "abreuery" \<atbreuer@\> wrote:  
> \> \>  
> \> \> Hi,  
> \> \>   
> \> \> I get an error message very similar to Mary's. When I type in:  
> \> \> devices = PsychPortAudio('GetDevices') or  
> \> \> devices = PsychPortAudio('GetDevices',3)  
> \> \>   
> \> \> I get the long error message I've pasted below, asking me to restart. I assume it may be related to the fact that there is no low latency device in my computer.  
> \> \>   
> \>   
> \> You have to call InitializePsychSound before calling any PsychPortAudio function on Windows, otherwise bad things may happen.  
> \>   
> \> \> Also, a partly related question, and please excuse me for what seems like an obvious question, when I type in the GetDevices command on similar PC we have, it returns the 1x8 struct:  
> \>   
> \> Look into devices(1), devices(2) etc. for the actual content.  
> \>   
> \> \> DeviceIndex  
> \> \> HostAudioAPIId  
> \> \> HostAudioAPIName  
> \> \> DeviceName  
> \> \> NrInputChannels  
> \> \> NrOutputChannels  
> \> \> LowInputLatency  
> \> \> HighInputLatency  
> \> \> LowOutputLatency  
> \> \> HighOutputLatency  
> \> \> DefaultSampleRate  
> \> \>   
> \> \> I'm not quite sure what to make of this. Does it indicate whether this second computer has a low latency device?  
> \> \>   
> \>   
> \> If the devices = PsychPortAudio('GetDevices',3) call gives you anything back, you have some ASIO hardware installed, which is as low-latency as it gets. If you don't have the relevant asio plugin from our wiki installed, or no ASIO soundcard, it won't work.  
> \>   
> \> Also, InitializePsychSound will already print out if you have asio support or not.  
> \>   
> \> best,  
> \> -mario  
> \>   
> \> \> Thanks for any help.  
> \> \>   
> \> \> Andreas  
> \> \> Action and Cognition Lab  
> \> \> University of Victoria  
> \> \>   
> \> \> And here's the error message:  
> \> \>   
> \> \> Unknown Windows exception of type=c06d007e was not caught.  
> \> \> ------------------------------------------------------------------------  
> \> \> Segmentation violation detected at Tue Jan 25 09:09:32 2011  
> \> \> ------------------------------------------------------------------------  
> \> \>   
> \> \> Configuration:  
> \> \> MATLAB Version: 7.1.0.246 (R14) Service Pack 3  
> \> \> MATLAB License: 292797  
> \> \> Operating System: Microsoft Windows XP  
> \> \> Window System: Version 5.1 (Build 2600: Service Pack 3)  
> \> \> Processor ID: x86 Family 15 Model 2 Stepping 9, GenuineIntel  
> \> \> Virtual Machine: Java 1.5.0 with Sun Microsystems Inc. Java HotSpot(TM) Client VM mixed mode  
> \> \> Default Charset: windows-1252  
> \> \>   
> \> \> Register State:  
> \> \> EAX = 00cddcc8 EBX = 00000000  
> \> \> ECX = 00000000 EDX = 00000000  
> \> \> ESI = 00cddd70 EDI = 00000000  
> \> \> EBP = 00cddd18 ESP = 00cddcc4  
> \> \> EIP = 7c812afb FLG = 00000202  
> \> \>   
> \> \> Stack Trace:  
> \> \> [0] kernel32.dll:0x7c812afb(0xc06d007e, 0, 1, 0x00cddd6c "\<ÝÍ")  
> \> \> [1] PsychPortAudio.dll:0x0f39da45(24, 0x00cddd3c, 0x0f3af7a4 "Open GetDeviceSettings ", 0x0f3af1e8 "Returns 'devices', an array of s..")  
> \> \> [2] PsychPortAudio.dll:0x0f393844(2487376, 0x00cdddc4, 0, 0x00cdddc8)  
> \> \> [3] PsychPortAudio.dll:0x0f3915fd(0, 0, 0, 0)  
> \> \> [4] PsychPortAudio.dll:0x0f384a64(1, 0x00cde660, 1, 0x00cde6c0)  
> \> \> [5] libmex.dll:\_mexRunMexFile(1, 0x00cde660, 1, 0x00cde6c0) + 103 bytes  
> \> \> [6] libmex.dll:private: void \_\_thiscall Mfh\_mex::runMexFileWithSignalProtection(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(1, 0x00cde660, 1, 0x00cde6c0) + 73 bytes  
> \> \> [7] libmex.dll:public: virtual void \_\_thiscall Mfh\_mex::dispatch\_file(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(1, 0x00cde660, 1, 0x00cde6c0) + 169 bytes  
> \> \> [8] m\_dispatcher.dll:public: virtual void \_\_thiscall Mfh\_file::dispatch\_fh(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(1, 0x00cde660, 1, 0x00cde6c0) + 271 bytes  
> \> \> [9] m\_interpreter.dll:int \_\_cdecl mdDispatch(int,char const \*,int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*,class Mfh\_MATLAB\_fn \* \*)(481, 0x0f177818 "PsychPortAudio", 1, 0x00cde660) + 88 bytes  
> \> \> [10] m\_interpreter.dll:\_inDispatchFromStack(481, 0x0f177818 "PsychPortAudio", 1, 1) + 800 bytes  
> \> \> [11] m\_interpreter.dll:enum opcodes \_\_cdecl inDispatchCall(char const \*,int,int,int,int \*,int \*)(0x0f177818 "PsychPortAudio", 481, 1, 1) + 145 bytes  
> \> \> [12] m\_interpreter.dll:int \_\_cdecl inInterp(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag volatile \*,int \*)(2, 0, 0, 0) + 2534 bytes  
> \> \> [13] m\_interpreter.dll:int \_\_cdecl inInterPcodeSJ(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag \*,int \*)(2, 0, 0, 0) + 282 bytes  
> \> \> [14] m\_interpreter.dll:\_inInterPcode(2, 0x784d6e7c, 0, 0) + 81 bytes  
> \> \> [15] m\_interpreter.dll:enum inExecutionStatus \_\_cdecl in\_local\_call\_eval\_function(int \*,struct \_pcodeheader \*,int \*,struct mxArray\_tag \* \* const,enum inDebugCheck)(0x00cdf278, 0x00cdf370, 2, 1) + 153 bytes  
> \> \> [16] m\_interpreter.dll:$L74683(0x784d6e7c, 0x0f293320 "devices = PsychPortAudio('GetDev..", 0, 0) + 184 bytes  
> \> \> [17] m\_interpreter.dll:enum inExecutionStatus \_\_cdecl inEvalCmdWithLocalReturnandtype(char const \*,int \*,enum inDebugCheck)(0x0f293320 "devices = PsychPortAudio('GetDev..", 0, 2, 0x00cdf3bc "DôÍ") + 69 bytes  
> \> \> [18] m\_interpreter.dll:\_inEvalCmdNoEnd(0x0f293320 "devices = PsychPortAudio('GetDev..", 1, 255, 0) + 16 bytes  
> \> \> [19] bridge.dll:enum inExecutionStatus \_\_cdecl ThrowSignal(char const \*)(0x0f293320 "devices = PsychPortAudio('GetDev..", 0x7c80b741, 0x012074a8, 0x012074a8) + 60 bytes  
> \> \> [20] bridge.dll:$L86781(0, 0, 0x784d6e58, 0x7c36b71f) + 432 bytes  
> \> \> [21] mcr.dll:public: void \_\_thiscall mcrInstance::mnParser(void)(271289, 0x505c3a43, 0x72676f72, 0x46206d61) + 93 bytes  
> \> \> [22] MATLAB.exe:0x00401ca9(4194304, 0, 271289, 0x012074a8)  
> \> \> [23] MATLAB.exe:0x00403d9f(0x00ead0b8, 24, 0x7ffdf000, 0xb6f7dce8)  
> \> \> [24] kernel32.dll:0x7c817077(0x00403c1a, 0, 0, 0)  
> \> \>   
> \> \> This error was detected while a MEX-file was running. If the MEX-file  
> \> \> is not an official MathWorks function, please examine its source code  
> \> \> for errors. Please consult the External Interfaces Guide for information  
> \> \> on debugging MEX-files.  
> \> \>   
> \> \> If it is an official MathWorks function, please  
> \> \> follow these steps in reporting this problem to The MathWorks so  
> \> \> that we have the best chance of correcting it:  
> \> \>   
> \> \> 1. Send this crash report to segv@ for automated analysis.  
> \> \> For your convenience, this information has been recorded in:  
> \> \> C:\DOCUME~1\Admin\LOCALS~1\Temp\matlab\_crash\_dump.3552  
> \> \>   
> \> \> 2. Also, if the problem is reproducible, send the crash report to  
> \> \> support@ along with:  
> \> \> - A specific list of steps that will reproduce the problem  
> \> \> - Any M, MEX, MDL or other files required to reproduce the problem  
> \> \> - Any error messages displayed to the command window  
> \> \> A technical support engineer will contact you with further information.  
> \> \>   
> \> \> Thank you for your assistance. Please save your workspace and restart  
> \> \> MATLAB before continuing your work.  
> \> \>   
> \> \>   
> \> \>   
> \> \>   
> \> \> --- In [psychtoolbox@yahoogroups.com](mailto:psychtoolbox@yahoogroups.com), "Mario" \<mario.kleiner@\> wrote:  
> \> \> \>  
> \> \> \> No, BasicSoundOutputDemo should have worked without the low-latency driver, and usually it does, at least i'm not aware of crash problems. But then the problem is "solved" by Mary's upgrade to the low-latency plugin and this seems to be an isolated failure case, so I'll not pursue this further unless many other people report trouble.  
> \> \> \>   
> \> \> \> Btw. the low-latency plugin for MS-Windows by itself will not provide any low-latency or improved timing accuracy, it just gives you the option of getting these if you have a proper ASIO sound card installed.  
> \> \> \>   
> \> \> \> best,  
> \> \> \> -mario  
> \> \> \>   
> \> \> \> --- In [psychtoolbox@yahoogroups.com](mailto:psychtoolbox@yahoogroups.com), David Fencsik \<fencsik@\> wrote:  
> \> \> \> \>  
> \> \> \> \> Dear Mary,  
> \> \> \> \>   
> \> \> \> \> Did you try following the directions in the error message you pasted  
> \> \> \> \> below? The first few lines might be helpful:  
> \> \> \> \>   
> \> \> \> \> Could not find a low-latency enhanced PortAudio driver. If you need  
> \> \> \> \> really accurate sound onset timing and latency \< 30 msecs, please read  
> \> \> \> \> "help InitializePsychSound" carefully and follow the instructions.  
> \> \> \> \>   
> \> \> \> \> Best,  
> \> \> \> \>   
> \> \> \> \> David  
> \> \> \> \>   
> \> \> \> \> On Tue, Oct 20, 2009 at 6:34 AM, mithagare \<mary@\> wrote:  
> \> \> \> \> \>  
> \> \> \> \> \> Hi there,  
> \> \> \> \> \>  
> \> \> \> \> \> I tried to run the BasicSoundOutputDemo on my PC running XP SP3, and it crashed Matlab with a segmentation fault. See below for output. Looking through the archives of this group, I tried to find previous messages referring to this type of problem and found this:  
> \> \> \> \> \>  
> \> \> \> \> \> [http://tech.groups.yahoo.com/group/psychtoolbox/message/7249](http://tech.groups.yahoo.com/group/psychtoolbox/message/7249)  
> \> \> \> \> \>  
> \> \> \> \> \> Following the discussion, I tried typing the following on the commandline:  
> \> \> \> \> \>  
> \> \> \> \> \> PsychPortAudio('Verbosity', 10); % To enable more debug output...  
> \> \> \> \> \> d=PsychPortAudio('GetDevices')  
> \> \> \> \> \>  
> \> \> \> \> \> The second statement caused the same crash. Any suggestions on what the problem might be? Could it be a SP3 issue?  
> \> \> \> \> \>  
> \> \> \> \> \> thanks!  
> \> \> \> \> \> Mary  
> \> \> \> \> \>  
> \> \> \> \> \> \>\> BasicSoundOutputDemo  
> \> \> \> \> \> Could not find a low-latency enhanced PortAudio driver. If you need  
> \> \> \> \> \> really accurate sound onset timing and latency \< 30 msecs, please read  
> \> \> \> \> \> "help InitializePsychSound" carefully and follow the instructions.  
> \> \> \> \> \> Will use our standard driver instead of enhanced driver...  
> \> \> \> \> \> Unknown Windows exception of type=c06d007e was not caught.  
> \> \> \> \> \> ----------------------------------------------------------  
> \> \> \> \> \> Segmentation violation detected at Tue Oct 20 09:24:39 2009  
> \> \> \> \> \> ----------------------------------------------------------  
> \> \> \> \> \>  
> \> \> \> \> \> Configuration:  
> \> \> \> \> \> MATLAB Version: 7.8.0.347 (R2009a)  
> \> \> \> \> \> MATLAB License: 2374  
> \> \> \> \> \> Operating System: Microsoft Windows XP  
> \> \> \> \> \> Window System: Version 5.1 (Build 2600: Service Pack 3)  
> \> \> \> \> \> Processor ID: x86 Family 6 Model 15 Stepping 11, GenuineIntel  
> \> \> \> \> \> Virtual Machine: Java 1.6.0\_04-b12 with Sun Microsystems Inc. Java HotSpot(TM) Client VM mixed mode  
> \> \> \> \> \> Default Encoding: windows-1252  
> \> \> \> \> \>  
> \> \> \> \> \> Fault Count: 1  
> \> \> \> \> \>  
> \> \> \> \> \> Register State:  
> \> \> \> \> \> EAX = 00c2bd28 EBX = 00000000  
> \> \> \> \> \> ECX = 00000000 EDX = 00000015  
> \> \> \> \> \> ESI = 00c2bdf0 EDI = 00000000  
> \> \> \> \> \> EBP = 00c2bd78 ESP = 00c2bd24  
> \> \> \> \> \> EIP = 7c812afb FLG = 00000202  
> \> \> \> \> \>  
> \> \> \> \> \> Stack Trace:  
> \> \> \> \> \> [0] kernel32.dll:0x7c812afb(0xc06d007e, 0, 1, 0x00c2bdec)  
> \> \> \> \> \> [1] PsychPortAudio.mexw32:0x055d4dd6(24, 0x00c2bd9c, 0x055eb22c "Open GetDeviceSettings ", 0)  
> \> \> \> \> \> [2] PsychPortAudio.mexw32:0x055d3f81(0x022a2bb8, 0, 0, 0x055eb250 "DeviceIndex")  
> \> \> \> \> \> [3] PsychPortAudio.mexw32:0x055cfdcd(0, 0, 0, 0)  
> \> \> \> \> \> [4] PsychPortAudio.mexw32:0x055c5a88(1, 0x00c2c690, 2, 0x00c2c600)  
> \> \> \> \> \> [5] libmex.dll:\_mexRunMexFile(1, 0x00c2c690, 2, 0x00c2c600) + 132 bytes  
> \> \> \> \> \> [6] libmex.dll:private: void \_\_thiscall Mfh\_mex::runMexFileWithSignalProtection(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(1, 0x00c2c690, 2, 0x00c2c600) + 73 bytes  
> \> \> \> \> \> [7] libmex.dll:public: virtual void \_\_thiscall Mfh\_mex::dispatch\_file(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(1, 0x00c2c690, 2, 0x00c2c600) + 321 bytes  
> \> \> \> \> \> [8] m\_dispatcher.dll:public: virtual void \_\_thiscall Mfh\_file::dispatch\_fh(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(1, 0x00c2c690, 2, 0x00c2c600) + 204 bytes  
> \> \> \> \> \> [9] m\_interpreter.dll:public: void \_\_thiscall ResolverFunctionDesc::CallFunction(int,struct mxArray\_tag \* \* const,int,struct mxArray\_tag \* \* const)(1, 0x00c2c690, 2, 0x00c2cdf8 "ÄÐÂ") + 81 bytes  
> \> \> \> \> \> [10] m\_interpreter.dll:public: bool \_\_thiscall Resolver::CallMFunction(int,int,class \_m\_operand \* const,union m\_operand\_storage \*,int,class \_m\_operand \* const,union m\_operand\_storage \*,int \*)(0x00c2c8d8, 1, 1, 0x10d86778) + 1209 bytes  
> \> \> \> \> \> [11] m\_interpreter.dll:private: bool \_\_thiscall accelImpl::MFunctionCall(struct \_accelOp \* \*)(0x0fa443a8, 0xffffffff, 0x10f3c4a0, 0x10f1efe0) + 266 bytes  
> \> \> \> \> \> [12] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelImpl::Exec(void)(0x00c2cdf8 "ÄÐÂ", 0xffffffff, 0xffffffff, 0x10f1efe0) + 170 bytes  
> \> \> \> \> \> [13] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelCode::Call(enum inMarshalType \*,int \*)const (0x00c2d098, 0xffffffff, 0, 0) + 115 bytes  
> \> \> \> \> \> [14] m\_interpreter.dll:public: static bool \_\_cdecl inJit::ExecuteHotSegment(struct \_inJitAccelInfo \*,enum opcodes \*,int \*,int \*)(0x00c2d1f4, 0x00c2d348, 0x00c2d2dc, 0x00c2d498) + 2523 bytes  
> \> \> \> \> \> [15] m\_interpreter.dll:int \_\_cdecl inInterp(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag volatile \*,int \*)(1, 764, 106, 0) + 826 bytes  
> \> \> \> \> \> [16] m\_interpreter.dll:int \_\_cdecl protected\_inInterp(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag \*,int \*)(1, 764, 80, 0) + 39 bytes  
> \> \> \> \> \> [17] m\_interpreter.dll:int \_\_cdecl inInterPcodeSJ(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag \*,int \*)(1, 764, 80, 0) + 251 bytes  
> \> \> \> \> \> [18] m\_interpreter.dll:int \_\_cdecl inExecuteMFunctionOrScript(class Mfh\_mp \*,bool)(0xffffff00, 0xffffffff, 0x10e8a390, 0) + 935 bytes  
> \> \> \> \> \> [19] m\_interpreter.dll:void \_\_cdecl inRunMfile(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*,class Mfh\_mp \*,struct inWorkSpace\_tag \*)(0, 0x00c2d830, 0, 0x00c2d7a0 "pØÂ") + 466 bytes  
> \> \> \> \> \> [20] m\_interpreter.dll:public: virtual void \_\_thiscall Mfh\_mp::dispatch\_file(struct \_mdUnknown\_workspace \*,int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0, 0x00c2d830, 0) + 23 bytes  
> \> \> \> \> \> [21] m\_interpreter.dll:public: virtual void \_\_thiscall Mfh\_mp::dispatch\_file(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0x00c2d830, 0, 0x00c2d7a0 "pØÂ") + 22 bytes  
> \> \> \> \> \> [22] m\_dispatcher.dll:public: virtual void \_\_thiscall Mfh\_file::dispatch\_fh(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0x00c2d830, 0, 0x00c2d7a0 "pØÂ") + 204 bytes  
> \> \> \> \> \> [23] m\_interpreter.dll:public: void \_\_thiscall ResolverFunctionDesc::CallFunction(int,struct mxArray\_tag \* \* const,int,struct mxArray\_tag \* \* const)(0, 0x00c2d830, 0, 0x00c2df98 "dâÂ") + 81 bytes  
> \> \> \> \> \> [24] m\_interpreter.dll:public: bool \_\_thiscall Resolver::CallMFunction(int,int,class \_m\_operand \* const,union m\_operand\_storage \*,int,class \_m\_operand \* const,union m\_operand\_storage \*,int \*)(0x00c2da78, 0, 1, 0x10d86028) + 1209 bytes  
> \> \> \> \> \> [25] m\_interpreter.dll:private: bool \_\_thiscall accelImpl::MFunctionCall(struct \_accelOp \* \*)(0, 0xffffffff, 0x10b50d00, 0x10dfa5d0) + 266 bytes  
> \> \> \> \> \> [26] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelImpl::Exec(void)(0x00c2df98 "dâÂ", 0xffffffff, 0xffffffff, 0x10dfa5d0) + 170 bytes  
> \> \> \> \> \> [27] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelCode::Call(enum inMarshalType \*,int \*)const (0x00c2e238, 0xffffffff, 0, 0) + 115 bytes  
> \> \> \> \> \> [28] m\_interpreter.dll:public: static bool \_\_cdecl inJit::ExecuteHotSegment(struct \_inJitAccelInfo \*,enum opcodes \*,int \*,int \*)(0x00c2e394, 0x00c2e4e8, 0x00c2e47c, 0x00c2e638) + 2523 bytes  
> \> \> \> \> \> [29] m\_interpreter.dll:int \_\_cdecl inInterp(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag volatile \*,int \*)(1, 670, 80, 0) + 826 bytes  
> \> \> \> \> \> [30] m\_interpreter.dll:int \_\_cdecl protected\_inInterp(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag \*,int \*)(1, 670, 57, 0) + 39 bytes  
> \> \> \> \> \> [31] m\_interpreter.dll:int \_\_cdecl inInterPcodeSJ(enum inDebugCheck,int,int,enum opcodes,struct inPcodeNest\_tag \*,int \*)(1, 670, 57, 0) + 251 bytes  
> \> \> \> \> \> [32] m\_interpreter.dll:int \_\_cdecl inExecuteMFunctionOrScript(class Mfh\_mp \*,bool)(0xffffff00, 0xffffffff, 0x10e89c70, 0) + 935 bytes  
> \> \> \> \> \> [33] m\_interpreter.dll:void \_\_cdecl inRunMfile(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*,class Mfh\_mp \*,struct inWorkSpace\_tag \*)(0, 0x00c2e9d0, 0, 0x00c2e940) + 466 bytes  
> \> \> \> \> \> [34] m\_interpreter.dll:public: virtual void \_\_thiscall Mfh\_mp::dispatch\_file(struct \_mdUnknown\_workspace \*,int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0, 0x00c2e9d0, 0) + 23 bytes  
> \> \> \> \> \> [35] m\_interpreter.dll:public: virtual void \_\_thiscall Mfh\_mp::dispatch\_file(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0x00c2e9d0, 0, 0x00c2e940) + 22 bytes  
> \> \> \> \> \> [36] m\_dispatcher.dll:public: virtual void \_\_thiscall Mfh\_file::dispatch\_fh(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*)(0, 0x00c2e9d0, 0, 0x00c2e940) + 204 bytes  
> \> \> \> \> \> [37] m\_interpreter.dll:public: void \_\_thiscall ResolverFunctionDesc::CallFunction(int,struct mxArray\_tag \* \* const,int,struct mxArray\_tag \* \* const)(0, 0x00c2e9d0, 0, 0x00c2f13c) + 81 bytes  
> \> \> \> \> \> [38] m\_interpreter.dll:public: bool \_\_thiscall Resolver::CallMFunction(int,int,class \_m\_operand \* const,union m\_operand\_storage \*,int,class \_m\_operand \* const,union m\_operand\_storage \*,int \*)(0x00c2ec18, 0, 1, 0x10d130e0) + 1209 bytes  
> \> \> \> \> \> [39] m\_interpreter.dll:private: bool \_\_thiscall accelImpl::MFunctionCall(struct \_accelOp \* \*)(0, 0xffffffff, 0x10b50f10, 0x10df6850) + 266 bytes  
> \> \> \> \> \> [40] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelImpl::Exec(void)(0x00c2f13c, 0xffffffff, 0xffffffff, 0x10df6850) + 170 bytes  
> \> \> \> \> \> [41] m\_interpreter.dll:public: enum jitReturnFlags \_\_thiscall accelCode::Call(enum inMarshalType \*,int \*)const (0x00c2f3dc, 0x10d1e650, 0, 0) + 115 bytes  
> \> \> \> \> \> [42] m\_interpreter.dll:public: static bool \_\_cdecl inJit::ExecuteHotSegment(struct \_inJitAccelInfo \*,enum opcodes \*,int \*,int \*)(0x00c2f4b0, 0x00c2f488, 0x00c2f4ac, 0x00c2f4a8) + 2523 bytes  
> \> \> \> \> \> [43] m\_interpreter.dll:int \_\_cdecl inExecuteMFunctionOrScript(class Mfh\_mp \*,bool)(0xffffff01, 0xffffffff, 0x10e89aa8, 0) + 572 bytes  
> \> \> \> \> \> [44] m\_interpreter.dll:void \_\_cdecl inRunMfile(int,struct mxArray\_tag \* \*,int,struct mxArray\_tag \* \*,class Mfh\_mp \*,struct inWorkSpace\_tag \*)(0, 0x00c2f9a0, 0, 0) + 466 bytes  
> \> \> \> \> \> [45] m\_interpreter.dll:public: virtual void \_\_thiscall Mfh\_mp::dispatch\_file(struct \_mdUnknown\_worksp  
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