Video: Add a Matrix Mixer

Last updated 10 August 2026

Every audio output already has a mixer — created for you, with that output's channel count. A matrix mixer is the one you add yourself, and its input and output counts are yours to choose. That mismatch is the whole point: 5.1 folded onto two speakers, a stereo pair spread across eight, or one input muted without touching the rest.

Before you start

1. Create the mixer

Outputs window → expand the Audio Mixer section → + → Matrix in the Create new Mixer popup.

2. Set its shape

With the new mixer selected, the Inspector carries Name, Inputs, Outputs and Sample Rate. Set the name, then the input and output counts. They do not have to match.

Under Volume, set the level of each channel.

3. Set the matrix

Expand Matrix and decide how each input channel feeds each output channel. Either choose a Preset or set the cells freely.

This grid is the feature. Everything else on the mixer exists to serve it: the counts decide the grid's shape, and the volumes trim what comes out of it.

4. Route it to an audio output

Open the Audio Routing window and connect the mixer to an audio output.

A matrix mixer is free-standing — unlike an output's own mixer it belongs to no device, so it reaches nothing until you route it here.

5. Send audio to it

In the Sequencer, select an audio channel and set its Destination to this mixer.

Hovering the entry tells you which kind of mixer you picked: "Assign to Matrix mixer" for this one, "Assign directly to output" for an output's own mixer.

Done when

Playing the sequence sends the channel's audio into the matrix mixer, which applies your grid and volumes and forwards the result to the output you routed it to — in the video, a 5.1 signal folded onto two speakers.