How to disable automatic gain control of windows XP sound card

I want to turn off the automatic gain control of windows xp sound card please suggest how to do so.

Thanks.

[Jan]

How did you enable the automatic gain control?

Is there any connection to MATLAB?

Answer 1

[Daniel Shub]

I am assuming you want to play a MATLAB array out the soundcard. If you want to programtically turn off the gain control so any program can by pass it, then you will need to provide a lot more information about the sound card and drivers.

To do it in MATLAB I would suggest using a portaudio implementation (e.g., pawavplay, playrec or psychtoolbox). Despite all the excess baggage, I would go with psychtoolbox.

By the way, are you sure your sound card has an automatic gain control? Do you consider clipping to be gain control?