Taken from GP32emu:

NeoGp32 is a NeoGeo Pocket emulator for the GP32. ThunderZ the author sent me a BETA to test, and it is currently running most games (all the ones I tested) at around 20FPS with GFX errors and no sound. Although having said that since he sent me the BETA he’s said that he now has all games working with no GFX errors at 12FPS 🙂 Also ThunderZ has somebody (who wants to remain annomous ) working on the sound part of NeoGp32.