I had a long 7 pin midi cabe and a short 5 pin cable. Bought a little experimenters box, a 5 pin din socket, a 7 pin din socket, and a 2.1mm PSU socket. Fixed them into the box, wired it all together (pins 1 and 7 are the power supply). 7 pin cable went into midimate, 5 pin cable into G-Force...