Chord Memorizer

The Chord Memorizer is a Max for Live MIDI effect by Max for Cats. It lets you easily create, play and store MIDI chords for chord progressions and chord patterns. Each key can store any chord!
Chord_Memo

Get the Chord Memorizer here:
Chord Memorizer

Get the Chord Memorizer and the Arp One As a bundle and save some! Available here
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XY Gesture MIDI

Part of the Gratis Pack

XY Gesture is a fun and useful device that lets you record your mouse movements and play them back as automation data for any parameter mappings – effectively turning your mouse / trackpad into a controller. You can store XY Gesture’s parameter assignments as presets and load them with your Sets.
Available at Ableton

XY_Gesture_MIDI_HR

Arp One

Arp One is a new Max for Live MIDI Arpeggiator with pattern functionality by Max for Cats. It works similar to the Live Arpeggiator, but lets you define between one and 16 step values for various parameters.
Arp_One

Note:
Arp One is now included as the revamped ‘ARP’ in the Ableton Max Essentials.

Ensemble

ENSEMBLE

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.
Ensemble_HR
Available here: https://www.ableton.com/en/packs/ensemble/

Download the Ensemble Manual:
Ensemble Manual v.0.9

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Ensemble offers 3 different Oscillator Modes:

A.: Distorted Triangle (waveforms changes to a upward- or downward Saw via modulation)
A-Model
B.: Rectangular Wave with variable Pulsewidth
B-Model
C.: Triangle with hyperbolic arc-tangent function:
C-Model