I have a GI-10, a GK-2, cables, and a DC adapter. I did a quick check. They are picking up vibrations properly. The GK-2 has a bit of rust. I found the manual. This is an interface for connecting a guitar to MIDI. - Model Name: GI-10 - Interface Type: Guitar-MIDI Interface - Country of Manufacture: Japan - Input Terminals: GK IN, MIC, IN - Output Terminals: MIDI OUT, HOLD, EXP PEDAL Thank you for looking.