Enveloping Genie – Model 2EG

Detailed feature set :

Range of under 1 mSec to over 10 Sec per envelope stage…summing up to 1:10000 or 0.003 to 30 seconds long envelopes.

ADSR, Gated Looping, and LFO Looping modes :
The MODE switch allows selection between three different modes of operation.
ADSR mode is a normal envelope.
Gated Looping will trigger the ATTACK stage when the GATE goes high, then continue looping whilst the GATE remains high, and will RELEASE to zero when the GATE goes low.
The LFO Looping mode loops continuously and ignores input from the GATE.

LFO frequencies to 300Hz :
Since the segment times can be as short as 1ms per stage, it is possible to produce LFO waveforms up to around 300Hz.
This can be controlled by the TIME CV input.

Exponential and Linear Envelopes
The module can produce classic exponential ADSR curves suitable for volume control with a linear VCA, or can produce linear envelopes typical of early digital synths. These can be more suitable for use with exponential VCAs, but are also useful for modulation control duties, or when using the envelope as an LFO.

Gate and Trigger Modes :
The module can be used with a Gate signal, but also reacts to short Trigger inputs. A range of AD and ASD envelopes can be produced by using Trigger alone.
In this mode Sustain acts as a bias offset voltage and Release has no effect.

Time CV for envelope/LFO modulation :
The TIME CV input shortens the entire envelope, providing global modulation of ATTACK, DECAY and RELEASE times.
Since this input works in LFO mode too, it can also provide frequency modulation of the LFO waveforms.

Level CV for voltage-controlled envelope depth :
The 2EG also includes a LEVEL CV input which controls the output level of the envelope.
This offers a very simple way to provide voltage-controlled envelope depth and acts as a VCA.
The Level CV is implemented using the reference voltage of the output DAC, so no resolution is lost at reduced amplitude.

Logarithmic time control response over 1:10,000 range :
The A, D and R control voltage inputs give the full range from 1 mSec to 10 Secs in four even decades, eg 1-10mSecs, 10-100mSecs, 100-1000mSecs, and 1-10Secs. The banana sockets and the pots are added together and processed by the module as a pair.

Normal and Inverted envelope modes :
With a switch the outer envelopes can set to produce a 10V biased signal, indicated by the blue LED
Now the envelope with be subtracted from that signal, perfect for controlling filters and simulating LPGs.

The middle envelope is a simplified version of the two outer ones.
It omits most of the CV control and requires a Gate signal.

The module also sports two 10V based logarithmic audio VCAs in the upper center section.
The envelope signals provided can be used to control these VCAs turning the module into a stereo amplifier