Alain, I can't test a few LEDs at a time. The idea is to light up the hole board to make it easy to spot non-working LEDs. I have 4 preliminary panels drawn so far, at least 1 more to go and they look like this:



I guess I could turn them on and off in sequence real fast, that should be just as good.

Robert

Light blue = rotary switches
Purple = rotary encoders
White = pushbutton
Red = pushbutton