still nothing.. maybe I wired it the wrong way? I've got everything hooked up like here: Simple Arduino Midi Controler | Starfire's Tech Blog (but then I plugged the wires in on the muxshield), except for the wires that come from the pots and normally go to the analog inputs. These I connected to pin 0 and 1 on the first multiplexer (for the moment, I'm using just 2 potmeters).