Generate notes (pitch and velocity data) in Max (Max/MSP) and send them to Ableton using noteout.
Similar video on sending controller data using ctlout: • Max to Ableton - ctlout (control out)
More advanced Max to Ableton mapping: • MIDI Mapping - Max to Ableton
If you are using Windows, you might need to install loopMIDI - https://www.tobias-erichsen.de/softwa...