Doepfer A-135-2 Quad VCA / VC Mixer

Four linear VCAs plus a VC mixer in 8 HP — DC coupled, jumper-configurable.

8 HP Eurorack module

Doepfer's A-135-2 packs four linear VCAs and a voltage-controlled mixer into 8 HP. Each VCA has a manual Level knob (L1–L4), a CV input with attenuator (CV1–CV4), a signal input, and an individual signal output. The four VCA outputs are summed internally to two mix jacks: Selected (only the VCAs whose individual outputs are unpatched) and All (always all four). Inputs and outputs are DC-coupled, so the module handles audio and control signals equally. Internal jumpers (JP4–JP10) rewire CV routing for stereo VCA, quad-VCA, and chain-normalled signal distribution modes.

Features

Four linear VCAs in 8 HP

DC-coupled audio + CV path

Per-channel manual Level knob plus CV input with attenuator

Per-channel individual signal output

Two mix outputs: Selected (unpatched channels only) and All (always all four)

Maximum mixer gain 0.6× to avoid clipping

Internal jumper-configurable CV routing (independent / stereo / quad-from-one-CV)

Optional jumper-normalled signal distribution chain (1 In → 2 In → 3 In → 4 In)

Skiff-friendly 45 mm depth

Small format makes it easy to dedicate one VCA per voice

Doepfer A-100 system standard build quality

How-To Guides

Quad VCA for four voices

Voltage-controlled four-channel mixer

One source → four levels (with internal JP8–JP10 jumpers)

Stereo VC amplifier (with JP7 jumper)

Compare Selected vs All mix taps

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Name: A-135-2 Quad VCA / VC Mixer
Brand: Doepfer

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Doepfer A-135-2 Quad VCA / VC Mixer

Features

Controls & Jacks (22)

How-To Guides

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