This is a really cool project! Is it possible to run a program in DOS to switch the sound card being emulated? I could see creating the ideal RX (Retro eXperience, you heard it here first) with .bat files for each different game/program with the desired sound settings.
Yes, to switch the card being emulated, you can flash new firmware images directly from DOS using the pgusinit.exe program that ships in the release package. It takes about 5 seconds to load the firmware and the new emulation is available to use right away without needing to reboot the machine.
Longer-term, I'd like to have multiple cores available in one firmware image for the ability to instantly enable/disable them. All code runs from RAM instead of flash for speed, so that's a potential limitation on the number of cores that can be loaded simultaneously.
