The latest BOSS guitar synthesizer products feature the Serial GK digital interface, a newly developed connection method that delivers evolved performance over the analog 13-pin GK interface used in earlier BOSS and Roland guitar synth and modeling products. The GKC-DA GK Converter allows you to drive a 13-pin GK device such as the BOSS SY-1000 or GP-10 using the Serial GK output on a GK-5 or GK-5B Divided Pickup or the GM-800 Guitar Synthesizer.