Hello, I'm really amazed with this giant and complete project, for me it seems a lot better than a lot commercial synth hardware I know! I'm technically clueless but I was seen that snes has the audio stuff in a module, very independient, that when it's used, it seems not uses the CPU, that's why it was "easy to do this: http://www.raphnet.net/electronique/snes_apu/snes_apu_en.php (connecting a snes-apu to parallel for sending it the songs and play it...) Even you can add sp/dif output, it's described for snes, but since you get the signals from the SNES APU, you can use it too: http://alpha-ii.com/Info/snes-spdif.html Personally, I think that is very probably easy to do an MIDIBOX SNES-APU, sorry if don't (I'm very newbie about this) Look at this pretty sound piece of hardware: http://einsteinsbreakfast.com/images/snespics/spc700.jpg Best regards,