Inspired by the classic string machines of the 1970s, Ensemble is a Max for Live string synthesiser with a unique built-in morphing formant filter. Ensemble also includes chorus and phaser effects which can be used separately.
Available here: https://www.ableton.com/en/packs/ensemble/
Download the Ensemble Manual:
Ensemble Manual v.0.9
Ensemble offers 3 different Oscillator Modes: