The A-141 is a voltage controlled envelope generator - the voltage controlled version of the A-140. Whenever a gate signal is sensed at the A-141’s gate input, an adjustable sequence of voltages is triggered - the envelope. The envelope can be used to modulate VCO, VCF, VCA or any control voltage destination.
The shape of the envelope is controlled by four parameters: Attack, Decay, Sustain, and Release. These parameters can be controlled manually or by voltage control via the dedicated CV inputs (each with an attenuator). The A-141 also has a retrigger facility: while the gate is open, a trigger pulse received at the retrigger socket will restart the envelope from the beginning of it’s attack phase.