This Ableton tutorial walks through how to map MPE's three expressive axes inside Wavetable's modulation matrix. The X axis controls pitch, the Y axis (called Slide) tracks vertical finger movement, and the Z axis captures pressure or aftertouch.
The demonstration maps Slide to the wavetable position, so moving a finger vertically while holding a note shifts the synthesis character in real time. Aftertouch is then mapped to the filter cutoff, letting pressure shape the tone dynamically as you play.
Seeing all three axes configured in sequence makes clear how MPE turns a single gesture into a multi-dimensional modulation source, and how Wavetable's MPE tab gives direct access to those mappings without additional routing.