I was previously having trouble with my sound in MAME with LaunchBox but I just updated my version to 0.279 and that fixed it.
I just finished playing Centipede when I scrolled down to play Donkey Kong but when I pushed the play button all the sound was gone.
I went back to Centipede to make sure it wasn't just a bug that would fix itself but no after that all sound in every game was gone.
Can someone please help me?