Ableton Forum

I was really hoping that there is a simple way to do that
Thanks anyway!

You can do it with a empty MIDI Effect Rack, add a Chain and in its Key Zone editor you can set a range of notes, notes outside the range won't pass.
https://www.ableton.com/en/manual/instrument-drum-and-effect-racks/
https://www.ableton.com/en/manual/instrument-drum-and-effect-racks/#18-5-2-key ...

Hi :)
I want as I play the piano (plugged as a midi controller) to emphasize the lowest note.
So I'm searching for a way to filter all the notes except the lower one, but it seems like there is no built in effect that does that.
There is a different way to do that? Maybe with some plug-in effect ...