Thanks.
1.) I tried the Settings tab, and it changed the volume of the menu music. This isn't my problem, but thank you nonetheless.
2.) I have actually gone through and tested a bunch of games that previously worked with the emulator, for instance Mega Man Battle Network 6: Cybeast Falzar, but like Mother 3, they have no sound as well.
3.) I deleted my old version (2.0.8) and downloaded the newest one (2.2.2) from WiiBrew. The sound still does not work, although the ROMs are still playable. I took the SAV from the SD card and tried it out with VBA on my laptop, and it opened fine, with music as well. I'll try 2.1.2 and hopefully it works.