I've said this before and I'll say it again (and I know, I never check to see if anyone replies!)...if you only want a GP32 for full speed SNES and Genesis emulation, with or without sound, you're going to be disappointed.
That is, unless you're willing to compromise or you're very patient. It won't run RPG's full speed, but it'll run some stuff like F-Zero, Super Off-Road maybe..the smallest stuff. It won't run fast enough to impress people, but if you REALLY want to play something, I'm sure it's fine.