Was just playing ball 3 on Mystic and the sounds changed! It was like they got higher in pitch and speeded up. For a while, I was thinking that my Alltek board had started playing sounds from the wrong machine. I’m still not sure.
When the ball drained, the bonus counting sound was strange. When the game was over, the attract mode lights seemed brighter, and it was playing strange music. Mystic does not play music in attract mode. (Unless that's a disabled option, maybe.)
Thinking back on it, the attract mode music may have been the usual background tune, but way speeded up.
It all went back to normal when I hit the button for a new game.
Anyone heard of that happening?