Roland BC-13 old style to new 13pin Roland Guitar Synthesizer cable converter

In 1989, towards the end of the original 24-pin guitar synth series, and the dawn of the 13-pin synths, Roland produced the BC-13. The BC-13 was specifically designed to allow 24-pin guitars to work with the new Roland GR-50 guitar synthesizer. The name is short for "Bus Converter 13." This is a neat little box that converts the 24-pin guitar signals into 13-pin signals.

There are three connectors on the BC-13: a 24-pin input connector, a 13-pin output connector, and a 1/4” guitar jack. Operation is simple: plug your vintage Roland guitar in the 24-pin connector, then use a C-13 (13-pin) cable to connect the BC-13 to your favorite 13-pin device.
Unless you were using a GK-1, you also needed to run a regular guitar cable from the 1/4” jack on the G-X0X guitar to the 1/4” input jack on the BC-13. Electronically, the BC-13 does several things: the high-output vintage GR signals are conditioned to match the lower level signals found in the new Roland GK-2/2A/3 style pickups.

Similarly, the filter knob (CV#1) output is adjusted to match the new Roland standard, and several digital transistors are used to adapt the Mode switch and the resonance knob (CV#2) to new switching functions.

YOU ARE BUYING ;
Roland BC-13 unit working fully, in good condition, very minor marks see photos.
No box or manual. This is a fantastic little unit a must for Guitar Synth Enthusiasts and ROLAND guitar collectors.