Hi, I've recently had a need for a note sustain effect in Ableton similar to that achieved on the piano by pressing down a foot pedal. I had the idea of actually taking the pedal from my keyboard which, when pressed, emits a single audio spike through a 1/4 inch jack. I've managed to turn this into a midi signal in Ableton with Pizmidi's Audio to MIDI plugin. Now while I can map the MIDI signal to turn a sustainer effect on in Ableton, I can't figure out how to get it to then turn the effect off when pressed a second time, the answer is probably really simple but I've searched everywhere and haven't found anything, is anyone able to offer any tips?