Doepfer A-135-4C Quad Envelope Follower


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.


Four audio inputs
Four CV outputs


3U Eurorack module, 8 HP wide

0.2 kg
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€ 19% VAT excl. €100.00 € 19% VAT incl. €119.00
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