http://www.destructoid.com/the-super-ga 8081.phtml
this was made specifically to emulate the feel of the controls on a gameboy so when you played your gameboy games with your super gameboy adapter for SNES, you'd feel comfortable with the controls.
they describe one button as "SPEED-Y - Toggle between two gradations of the slow-motion feature".
if i was using LSDJ, do you think this button would adjust the tempo or pitch of the music when it was playing back?