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The second envelope generator is intended as a modulation envelope generator to e.g. sweep a filter or control the harmonic waveshaping of an OSC HRM module. It has an extra output that is controlled by a bipolar mix knob that can invert the envelope shape and also gives some extra overall ‘sink’ or ‘lift’ when the output level is increased. Rate can be set from a glitch to about a minute.<ref name="rh" />
When modulating decay times with control voltages it is good advise to keep the voltage fixed while the envelope is developing. E.g. trying to modulate the decay time with an audio rate signal does in general not produce sensible results. A S&H is integrated into the module to sample the decaytime modulation input signal for the second envelope generator on every new gate trigger. This way the modulation amount will stay fixed until the module is triggered again by a new gate pulse. The sampled signal is also brought out on a connector, so it can be routed to a CV input on the first ADBDR envelope generator. Or be used in any other S&H application.<ref name="rh" />
The ADBDR envelope is designed in a way that is hás to finish its attack phase to reach its peak level before it can be retriggered. When used for sequencing this allows for complex envelope shapes that give interesting rhythmic effects, but when used for keyboard play it might feel a bit strange to play the module with long attack times and fast play. Note that there are no attenuator knobs to set the amount of modulation for the ADBDR envelope CV inputs, these inputs are at full sensitivity. They can be connected directly to e.g. the velocity CV or CC# CV outputs of a MIDItoCV converter, but when modulated from other sources one might need an extra CV mixer module to set the modulation levels properly.<ref name="rh" />
{{From Muff Wiggler wiki|Rob Hordijk Designs}}
== References ==
{{reflist}}
== External links ==
* Rob Hordijk explains the [http://www.youtube.com/watch?v=Knbkv6OxcsE&list=PLAC347DE38ABA9E8D&index=4 Dual Envelope Generator] at the European Electro Music Event 2012, Mallorca, Spain.
[[Category:Original Rob Hordijk Design]]
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