Thanks,suavekeith. I've had this toy for several years & always wanted to rig it with triggers.Not too impressive until the drummers move,so I'll post it sometime.Whoever designed this cheap toy did a good job.The control 'brain' sends out a pulse to trigger a servo, ( on each player), that spins left & right.Don't know circuits...but maybe a positive wave turns one direction & a negative wave the other ? daveb ? you could probably figure it out. Then the timing sequence for the trigger pulses to play the tones in the proper order ( & timing). I was going to peek inside the 'brain' unit ,but I might mess up some decorative trim,so for now the guts are a mystery.The decorative brain looks like a bass drum & it's 6" in diameter & about 3" deep. The little drummers are 5" tall. The mallets are a tiny 1" spring with a 1/4" round plastic tip.