seems to be easy to rectify via a opamp and then a zero and span circuit or even easier using a microcontroller instead the zero and span, just few lines of programming, thats all..
best
killabyte
it should work, but should be aware about some issues: switched power supplies like a pc one, will produce much noise in the audio band, because of the current switching.
pc supplies are not intended to withstand for extreme current requirements like a bass sound, so would oscilate or shut...