Couldn't find this by searching, so I guess I'll just post a new topic. I'm having a problem with the sound in X-Men - Reign of Apocalypse for GBA. I'm using Visualboy Advance version 1.7.1, and it says I need the correct BIOS file. Okay, so where can I find the correct BIOS file? "Unsupported BIOS function 1d called from 0801fd6a. A BIOS file is needed in order to get the correct behavior." is the exact error message I'm getting.