Mixers

WR-CP3A-M

The WR-CP3A-M - a console-panel-style 4-channel mixer with complementary outputs and warm transistor saturation.

The WR-CP3A-M

The WR-CP3A-M is a 4-channel audio mixer. Each channel has a GAIN knob with audio-taper (x^2) response for finer control at low levels, plus a MUTE toggle. Channels sum into a MASTER gain stage that reaches +6 dB (x2), and the result is exposed on complementary + and - outputs - one in phase, one inverted.

A dedicated DRIVE knob controls bus saturation. At zero the mix is a clean linear sum; turning DRIVE up applies progressively stronger tanh soft-clip on the post-master signal, adding warm musical saturation when pushed. The saturation is opt-in - the default position is clean.

The whole signal path is DC-coupled, so the WR-CP3A-M doubles as a CV summer for stacking envelopes, blending pitch CVs into chords, or summing modulation sources. The two complementary outputs are mathematical negatives of each other, useful for phase-cancellation tricks, balanced lines, or driving two destinations from one mix without a separate mult.

The WR-CP3A-M

The WR-CP3A-M has ten controls: four GAIN knobs (G1 ... G4, 0-1 audio-taper), four MUTE toggles (M1 ... M4), a MASTER gain (0-2, reaches +6 dB), and a DRIVE knob (0-1, 0 = clean linear sum, higher = progressively stronger tanh soft-clip on the bus). Four audio inputs (IN 1 ... IN 4), two audio outputs (OUT + non-inverted, OUT - inverted). DC-coupled across the entire signal path so it sums CV as readily as audio. The drive saturation runs as tanh((sum * master / 5) * (1 + drive)) then scales back to ±5 V, giving sensible saturation in the nominal Eurorack range.

In a patch

Anywhere multiple signals need to combine. Sum three oscillators into a chord, blend a WR-921 saw with WR-923 pink noise for a textured pad, layer a sub sine under a saw for body. The complementary + and - outputs allow phase-cancellation tricks - feed a signal into one channel and the inverted version of itself into another to null it out, useful for mid-side style processing.

As a CV summer the WR-CP3A-M is unusual. The DC-coupling means three WR-911 envelopes can sum into one composite envelope with shared dynamics, or an LFO can fan into the same channel as an envelope to add tremolo on top of an amplitude shape.

Pair it with the WR-CP3A-O for a console-style routing workflow: the WR-CP3A-M sums audio at the end of the voice chain, the WR-CP3A-O routes controller CVs at the beginning. Useful alongside a WR-921 voice and an output.

Inputs

IN 1 (audio) — Channel 1 input. DC-coupled, so CV works here as well as audio.
IN 2 (audio) — Channel 2 input.
IN 3 (audio) — Channel 3 input.
IN 4 (audio) — Channel 4 input.

Outputs

OUT + (audio) — Non-inverted main output. The normal "mixer out".
OUT - (audio) — Inverted main output. Phase-cancellation tricks, or drive one channel's inverted source into another channel to null it out.

Controls

Main — Main gain. 0 to 2x (+6 dB). Scales the summed signal before the +/- outputs.

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