Rob Hordijk Dual Phaser: Difference between revisions
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<b>Dual Envelope Generator</b> |
<b>Dual Envelope Generator</b><br> |
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Price 295 euro<br> |
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The Dual Envelope module (DUAL ENV) is a fully voltage controlled envelope generator |
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specifically designed to be used with sequenced music. There are two different types of |
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envelopes available, one is a four stage (attack, decay1, break level, decay2, release) envelope |
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and the second is a one stage envelope (decay only). Both envelope generators share the same |
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gate input, meaning that they can not be triggered separately. Triggering treshold is at roughly |
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100mV above ground and also accepts e.g. triangle waves. |
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The ADBDR envelope is primarily intended to be used for volume envelopes. When the |
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decay2 knob on the first envelope generator is fully open the decay2 acts like the sustain that |
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you find on most of the traditional envelope generators. In this case the break control will act |
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like the sustain level. There are CV inputs for the attack, decay1, decay2 and release rates. |
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The CV for the attack is inversed, so increasing the CV level will shorten the attack time |
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while increasing the decay times for the decay1, decay2 and release. This means that when |
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e.g. the key velocity voltage is used a higher velocity will shorten the attack and increase the |
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other decay times. Rate settings can be from really snappy to pretty slow. Care was taken that |
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you still have good control over the rates when in the snappy range. |
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The second envelope generator is intended as a modulation envelope generator to e.g. sweep a |
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filter or control the harmonic waveshaping of an OSC HRM module. It has an extra output |
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that is controlled by a bipolar mix knob that can invert the envelope shape and also gives |
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some extra overall ‘sink’ or ‘lift’ when the output level is increased. Rate can be set from a |
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glitch to about a minute. |
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When modulating decay times with control voltages it is good advise to keep the voltage fixed |
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while the envelope is developing. E.g. trying to modulate the decay time with an audio rate |
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signal does in general not produce sensible results. A S&H is integrated into the module to |
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sample the decaytime modulation input signal for the second envelope generator on every |
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new gate trigger. This way the modulation amount will stay fixed until the module is triggered |
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again by a new gate pulse. The sampled signal is also brought out on a connector, so it can be |
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routed to a CV input on the first ADBDR envelope generator. Or be used in any other S&H |
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application. |
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The ADBDR envelope is designed in a way that is hás to finish its attack phase to reach its |
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peak level before it can be retriggered. When used for sequencing this allows for complex |
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envelope shapes that give interesting rhythmic effects, but when used for keyboard play it |
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might feel a bit strange to play the module with long attack times and fast play. |
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Note that there are no attenuator knobs to set the amount of modulation for the ADBDR |
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envelope CV inputs, these inputs are at full sensitivity. They can be connected directly to e.g. |
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the velocity CV or CC# CV outputs of a MIDItoCV converter, but when modulated from |
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other sources one might need an extra CV mixer module to set the modulation levels properly |