Normal plastic jacks, I think they're called amp style. The jacks are black obviously, only the hex nuts are colored. I got them from Musikding Germany, they have them in black, blue, red, green, yellow, gray and white. Paid 12 Eurocents per piece for them, really cheap.
, apart for some pops from the rotary switches but that's not really a problem as I can't switching while playing. The idea is to select effect (chains) for each signal path and switch or blend between them with the expression pedal. Next plan will probably be to put it all in one box......