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This plugins will contain all modulation sources. On V0.6,  it contains twin quartet and relief, a dual quadratic LFO (free) and a complex envelope generator (commercial). 
Twin quartet is pretty usefull for rotary effects, shepard tones, stereo effects,...
The complex envelope can be used for bouncy effects, complex synth pacth triggering, delay (on trigger signals), level detector,...
This tutorial by Omri Cohen explains the main features of this plugin.