Looking for a splitter board for Roland Guitar synth. 2012-12-30 by grayz4sure Here are the pin assignments: http://johnp.net/projects/guitar-synth/roland-pinouts.html#13pin I want to use TWO synth guitar pickups both sending 13 signals and be able to switch back and forth with a simple toggle between the two signals going into a single GR-20. any advice would be appreciated. jeremy