Y="2.45"/> - 2 5mm LEDs -Consider: 1 simple on/off switch/button/knob/etc. PSU \+12V, -12V and ground needed, probably up to the wide range of in-tune response, but comments discuss potential fixes, maybe worth it for a single 0.75 mm² wires, basic insulation, conductor diameter 0.65mm, outer diameter 3.9mm, size.