Hey Steve, as GB says, there is a spot (ac adapter power socket) near the MP1's midi connectors to plug in the ac adapter, the 7 pin lead uses 2 pins to carry that power to the MC1 (you can also plug the ac adapter directly into the MC1 to power it, just not as tidy/convenient), you also have to set the midi channel stuff as the MC1 can transmit on midi channel 1 through 16 or all and the MP1 can receive on midi channel 1 through 16 or all, setting both to "all" is easiest as all you are sending (with MC1) is midi program changes. Have you read the MP1 manual ? It covers all this stuff in detail. Also setting midi channel of MC1 (and other MC1 settings) requires pressing correct buttons together (e.g. bank up 9 etc). The MC1 has a Ziolog Z80 processor in it, this was a predecessor CPU to the early IBM x86pcs and embedded in quite a few devices.