A nice device but the manual is quite rare. Here is a copy:
Part of the Gratis Pack
Bertha 2 is a polyphonic additive synthesizer with a few extras. With its eight tone generators, and drawbar-style control, Bertha 2 excels at producing sounds reminiscent of vintage Farfisa or Vox transistor organs. The requisite vibrato, chorus and distortion effects, along with the Leslie speaker simulation, let you conjure up all manner of classic organ tones for the garage, the arena, and the church. Going beyond the earthly realm is simply a matter of engaging Bertha 2’s microtonal mode and taking advantage of the device’s full-featured ADSR envelope – fascinating, otherworldly textures await.
Available at Ableton
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:
Max for Cats presents DiGiTAL, a powerful polyphonic synth that fuses aspects of additive, wavetable, frequency modulation and subtractive synthesis. DiGiTAL is distinctly designed for creating new sounds and provides a comprehensive set of controls expressly for this purpose.
Available here: https://www.ableton.com/en/packs/digital/
Download the user manual here: