The Big Brain Academy Download Demo has some audio glitches. (Rough sound while running at full speed)
Do you think you could alert Mr. Korth, Rockmangames?
P.S. Another app that may be useful for debugging sound is Moonshell. I have an old version that can be run in an emulator. (Newer ones need flashcarts) THis version takes an mp3 and builds a nds file that can be run on an emulator or a flashcart that doesn't have FAT. Moonshell has very stuttery sound while running at full speed in the emulator.