I had a couple problems, but nothing too big. I think I know where I messed up. Well, all brstm files were made stereo using Audacity 1.3.7 with whatever hertz the song came in (i.e. Rebellion Ragna's Theme = 44100Hz). That's probably already a problem haha. There were character textures being used, but I never had a problem with those.
When using Final Destination with Ragna's Theme replacing Final Destination the song worked fine until about 0:45 1:10 where it turned into static. Maybe I just need to change the hertz.
When using battlefield with song Menu (SSBM) replaced by "Under Heaven Destruction - ragna vs jin" the song worked fine until about 1:00 where it was replaced by "One winged angel" which was a replacement of "credits (SSB)" on the Final Destination stage... That song worked fine though, haha.
Only 1 freeze - Norfair Marionation Gear replaced by Gouki/Akuma's theme. Marth with kefka texture and CPU G&W were used to test the song. No level textures, no items, 3 stock, no stock timer.
Oh, I replaced song file X02.brstm (which is menu 01 for the character select menu) with "clubbed to death" cropped short. The song worked under my music, but wouldn't actually play during the menu (all other menu songs were turned off).
I don't see a big problem. I'll probably redo the .brstm with less hertz and hopefully that'll work. Not complaining, by the way; I'm just reporting since this is still new
Thanks so much for your hard work. I can only wish I had a SD card bigger than 256 megs... (My other for mah cam is 8, so the wii can't read it...)
Edit: The program I used to create the .brstm is here
http://www.smashboards.com/showthread.php?t=240648