Ableton Midi Messages

[Barely Human]

I think this is probably impossible, but im wondering if there is anyway of getting ableton to accept note on, and note off messages, so i can link an effect on/off switch to a key, and when i press it down, the effect is on, when i let go, the effect is off???

[ampassasinbirmingham]

not sure if there is, id just use a knob or slider for wet/dry