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Module A-141 (VCADSR) is a voltage controlled envelope generator - the voltage controlled version of the A-140. Whenever a gate signal is sensed at the VCADSR's gate input, an adjustable sequence of voltages is triggered - the envelope. You can then use these envelopes to modulate a VCO, VCF and/or VCA, and alter the input and output voltages of all sorts of modules.
The shape of the envelope is governed by four parameters: Attack, Decay, Sustain and Release. On the A-141, these parameters can be controlled by hand, or by voltage control, via the dedicated CV inputs (each with an attenuator).
The A-141 VCADSR also has a retrigger facility: while the gate is open, a trigger pulse received at the retrigger socket will re-start the envelope from the beginning of its attack phase.
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