The GKP-2 GK Parallel Cable from Roland allows you to play through your GP-10 guitar processor pedal and another 13-pin GK device simultaneously. The cable is 29" in length and features two 13-pin male connectors on one end, and one 13-pin female connector on the other. One of the 13-pin DIN male connectors provides power.
Roland GKP-2 Specs
1 x 13-pin DIN type female input
1 x 13-pin DIN type male output (with power supply)
1 x 13-pin DIN type male output