Added info about the gate / trig toggle switch on new versions.
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Both envelope generators share the same gate input, meaning that they can not be triggered separately, though in later versions ENV B featured a toggle switch to allow self-cycling. This also features two LEDs to indicate the gate status of each envelope.
[[File:Hordijk_de_fc.png|thumb|right|200px|The Dual Envelope flowchart]]The ADBDR envelope is primarily intended to be used for volume envelopes. When the decay2 knob on the first envelope generator is fully open the decay2 acts like the sustain that you find on most of the traditional envelope generators. In this case the break control will act like the sustain level. There are CV inputs for the attack, decay1, decay2 and release rates. The CV for the attack is inversed, so increasing the CV level will shorten the attack time while increasing the decay times for the decay1, decay2 and release. This means that when e.g. the key velocity voltage is used a higher velocity will shorten the attack and increase the other decay times. Rate settings can be from really snappy to pretty slow. Care was taken that you still have good control over the rates when in the snappy range.▼
Triggering threshold is roughly 100mV above ground, and can be triggered by wave forms other than pulses, e.g. triangle waves.<ref name="rh">Rob Hordijk</ref>
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.▼
=== ENV A ===
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.▼
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The CV input for attack is inverted, so increasing the CV level will shorten the attack time while increasing the decay times for decay 1, decay 2, and release. This means that when MIDI velocity is used as a CV a higher velocity will shorten the attack and increase the other decay times.<ref name="rh" />
Rate settings can be from really snappy to pretty slow. Care was taken that you still have good control over the rates when in the snappy range.<ref name="rh" />
==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.▼
The ADBDR envelope is designed to finish its attack phase before it can be re-triggered. When used for sequencing this allows for complex envelope shapes producing interesting rhythmic effects, but when used for fast keyboard play it might feel a bit strange to play the module with long attack times.<ref name="rh" />
[[Category:Rob Hordijk Designs]]▼
[[Category:MU modules]]▼
Note that there are no attenuator knobs to set the amount of modulation for the ADBDR envelope CV inputs allowing for direct connection to velocity CV or CC#. However when modulated from other sources they might need extra CV processing to set the modulation levels properly.<ref name="rh" />
=== Gate or Trig Toggle ===
New versions of the module feature a toggle switch to select between GATE or TRIG modes. When using long pulses or 'gates' as inputs the envelope will pause at the break level while the gate is high, and continue when the gate is low. Toggle mode will simply run through all stages of the function without interruption. <!-- Need to clarify this with testing or Rob. -->
=== ENV B ===
The second envelope generator is intended as a modulation envelope generator to e.g. sweep a filter or control the harmonic wave shaping of an [[Rob Hordijk OSC HRM|OSC HRM]]. The range is from several milliseconds to about a minute.<ref name="rh" />
▲
=== Sample & Hold ===
▲When modulating decay times with control voltages it is good advise to keep the voltage fixed while the envelope is developing.
[[File:RobHordijk-OSCSYNC-DUALENV-TWINPEAK.jpg.jpg|thumb|A Rob Hordijk DUAL ENV filter (centre) in triple-module format with a TWIN PEAK (right) and OSC SYNC (left) - this version features a toggle switch for GATE or TRIG modes, and another for ENV B self-cycling mode.]]
=== Normalisations ===
Many of Rob's designs feature internal connections or 'normalisations' between inputs and outputs. These can be broken by inserting jacks into the inputs. When found together in triple-module formation the following normalised connections were made:
* TRIPLE LF-VCO - B PULSE > DUAL ENV - GATE IN
* DUAL ENV - ENV A OUT > TWINPEAK - VCA CV
== References ==
{{From Mod Wiggler Wiki|Rob Hordijk Designs}}
{{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.
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