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Running in Full Duplex Mode
If your sound card supports full duplex mode, then you can simultaneously access your sound card's D/A and A/D converter. You must have the appropriate full duplex driver installed to use this functionality. Simultaneous A/D and D/A conversions must be performed at the same sample rate. If you try to run in full duplex mode, and your sound card does not support this mode or you don't have the correct driver installed, then the following error is returned.?? Error using ==> daqdevice/start Device 'Winsound' already in use.