Thomas G and I have been wanting to fit some sort of 'on' indicator light for use with the standard Moog Etherwave; so I came up with this. I decided to fit an LED (in this case I used a green one with resistor as it was brighter than the red equivalents I had & it was a bit different). I used the registered trade mark circle as a good position for the LED as that was effectively already marked out for me! The pictures really show the rest of the set-up. LED retained in the 5mm hole with a dab of hot glue. It all works well! Used the same colour coding as Moog used. Orange for the positive supply & green for the ground/negative.