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Back4 pins (http://www.qingpu-electronics.com/en/products/WQP-PJ320E-177.html PJ31060-I 6pin SMD 3.5mm stereo headphones jack. Headphones jack (http://www.china-bsun.com/Product48/1577.html headphones jack plug stereo 3.5mm PJ311 Headphones with microphone connector, 3.5mm, 4 pins for trigger, gate, and CV lines? **UI:** - 3 5mm LEDs -Consider: 1 simple on/off switch/button/knob/etc. PSU \+12V, -12V and ground needed, probably up to 1amp