It makes my high quality (though mono) 16-bit 44100Hz Lego Racers music for the main menu sound like GoldSrc Half-Life quality (maybe because they're 2D?)
Facing away from any audio source, such as an active music block, will make it sound low quality, this also happens when you're in first person and firing items that make noises, like the spray can, or the Assault Rifle from the Raycasting Weapons pack
I assume that's intentional though? It just sounds kinda bad to me, but this is a pretty big improvement to Blockland's audio, and there doesn't seem to be any bugs for me either