via this auction
"Circuit-bent TR-707 by Alien Devices. The toggle switches along the sides of top of the drum machine create different kinds of circuit bent noises when switched on. If the switches are not turned on, it will operate like a normal TR-707. Do not turn all the switches on at once or the drum machine will turn-off and you will need to turn some switches off to reboot. Although it has some scratches and does not look new, it is fairly clean and is in good operating condition."
