The Complex Envelope Generator is based on one channel of the existing MiniMod Dual EG.
In order to increase versatility, it has a Release control added to the envelope so that it is full ADSR but still with the characteristics of the Model D. However, further additions were made: a pulse delay and pulse stretch circuit, along with a re-trigger facility (both of these can be switched out of circuit so that the envelope is a simple ADSR unit).
The addition of pulse conditioning and retrigger makes it into an LFO module and it can perform in a similar way to the EMS Synthi A and VCS3 Trapezoid generator, but with a full ADSR envelope too...