I've been editing my Omega Ruby ROM for a few months now, editing textures, swapping models and switching and creating music. After playing through a ROM with a pretty much new soundtrack with fan remixes, animé versions etc, I decided to do the same with my X ROM. Only I decrypted my ROM (using rxtools) for the first time earlier, the sound folder wasn't full of BCSTM files, but AAC (ADTS) ones. When I tried to add a BCSTM file in place of the AAC one, as predicted, it crashed (the first Shauna battle, incidentally). Swapping the AAC filenames works fine, so you can have the World Championships theme as the trainer battle music if you want, but adding custom tracks seems to be possible. Is there a way? I haven't tried yet, but presumably you can add a custom AAC file and it will work fine. But what about the loop points? I know BCSTM files have loop points stored in them, but what about AAC? I thought XY and ORAS were built on the same engine and would work the same but obviously not. I don't know if there's a workaround by decrypting the ROM in a different way?