okay, i think there's just something about the 3ds gb virtual console that doesn't like whatever lsdj does
if anyone else wants to run lsdj on their 3ds: i can run it using gameyob (a gb/c emulator for 3ds) just fine, and i suspect that retroarch will also work, so try that if the gb virtual console is giving you trouble
@typhlosion Retroarch did work well but as soon as I played with the emu's pause menu the audio desynced and became glitchy. But it was a years old version of RA on 3DS and I haven't tried again sice.