The A-135-4C is composed of four envelope followers with adjustable attack and release. The circuit was designed to be used as an addition for the A-135-4A/B Performance Mixer, adding ducking, compressor and expander functions to the mixing system. However, thanks to a full set of inputs and outputs, it is also possible to employ the A-135-4C for other tasks.

The A-135-4C offers four identical envelope followers. Each modulator comes equipped with an audio input, attack and release potentiometers as well as a CV output. LEDs visualize control voltages generated by the module. The A-135-4C can be connected to the A-135-4A/B Performance Mixer via a Ribbon cable. Users are able to determine whether audio material gets tapped off directly after the input connectors, behind the gain stages or after the level control of the A-135-4A. By plugging in patch cables into the envelope follower’s inputs, the internal routing can be suspended.

CONNECTORS
Four audio inputs
Four CV outputs

DIMENSIONS
3U Eurorack module, 8 HP wide

ConditionBrand New (New)
Brand New items are sold by an authorized dealer or original builder and include all original packaging.Learn more
Brand
Model
  • A-135-4C VCPM Quad Envelope Follower
Categories
Horizontal Pitch
  • 8HP
Synth Module Function
  • Envelope
  • Expander
Modular Synth Format
  • Eurorack

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Signal Sounds

Warszawa, Poland
Joined Reverb:2026

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