via this auction
"There is only one power supply(the korgs) and the Korg still has the external midi input available. They keyboards midi signal is soldered into thekorgs midi input internally. Only one input can be used at a time. That is either control it by the alesis keyboard, or flip the switch and control it externally. There is a little bit of black tape under the switch to hide a hole from the existing alesis enclosure..."Looks like a Minibrute!
