Sorry for the delays, been very busy lately. Give this a try:
sound_data.sdat
Use NDSTool to extract the rom contents, then replace the \data\sound_data.sdat file with the one linked above and recompile the rom.
I thought it was perfect, then I ran into an issue with one track. I think I have it fixed completely now, but I haven't had a chance to test it yet. For all I know, the latest fix might have buggered the entire file.
Can't test it out because the wife is dominating the DS right now. Let me know how it works for you.
sound_data.sdat
Use NDSTool to extract the rom contents, then replace the \data\sound_data.sdat file with the one linked above and recompile the rom.
I thought it was perfect, then I ran into an issue with one track. I think I have it fixed completely now, but I haven't had a chance to test it yet. For all I know, the latest fix might have buggered the entire file.