But you may want to check out the source to R.Belmont's M1 . This is a music player for many supported roms including numerous QSound CPS2 games (it actually should support most but it may not be updated to support the newest dumps out there). Other than that the MAME source from MAMEDev probably has all the documentation available on QSound. However, QSound emulation isn't fully complete so I'm not sure what that impact that will have on you trying to extract the sound data.
_ _ - - = = Pr3tty F1y = = - - _ _