hey cracker, im using GPSP-J to play Metroid Fusion (U), and GBAATM 1.9.9.4, and after the trainer menu opens, sounds are all crackled and unbearable to hear, the cheats I use are from http://cheats.codetwink.com/gba/view/5054/
I haven't touched any options.
Thanks for gbaatm, it rocks.