That would probably be a question for the FMOD forums at fmod.org. SGDK2 uses FMODEx version 0.4.6.1. Maybe a newer version of FMODEx can play it better. If not, maybe the forum members will have some idea. If you can confirm that it works with other FMOD applications, but only SGDK2 has a problem, then I'll have to look into it further, but it seems like it would be a problem within FMOD. SGDK2 uses the "FMOD.MODE.OPENMEMORY" flag to load the sound from memory, BTW.