Well I ain't an audio expert, but I would mind seeing:
8 channels of sound.
Definable left/centre/right for each channel (or the four new channels). Preferably capable of a nice smooth pan.
Sure, a 68000 can software mix 8 channels of audio down into 4, but it's not doing much else at that time (which ain't too hot for a multitasking computer). Nice to have it all done in hardware, without having to end some notes early to play another one, etc.
Also it would be nice if the end spec was published, so, for example, MiniMig could implement that audio spec (on a hardware level at least, maybe the outputs wouldn't be the same quality) which would increase the market for that implementation, thus increasing the software that would support it.
