Volume and Mute
Every source in pMix has independent volume and mute controls, plus a master fader for the overall output.
Adjusting volume
- Drag the fader on a source’s channel strip to set its volume (0–100%)
- Volume is linear — 50% means half the signal level
- Changes take effect immediately with no latency
Muting a source
- Tap the mute button on a source’s channel strip to toggle its audio on or off
- A muted source still shows in the video — only its audio is silenced
- Muted sources show a mute indicator on their VU meters
Master volume
The master fader at the bottom of the mixer controls the combined output level. It scales all source volumes proportionally. For example, if a source is at 80% and the master is at 50%, the effective output is 40%.
Audio-follow-video (AFV)
Instead of manually muting and unmuting sources during switching, enable AFV on each source. pMix automatically unmutes the on-program source and mutes everything else. See Audio Mixer Overview for details.
VU meters
Each source displays real-time VU meters with:
- Green — Safe audio levels
- Yellow — Approaching peak
- Red — Clipping / too loud
The meters use fast attack and slow decay for natural, readable movement. Aim to keep levels peaking in the green-to-yellow range.
OSC control
Volume and mute can be controlled via OSC:
| Address | Args | Description |
|---|---|---|
/pmix/audio/{n}/volume |
float 0–1 | Set slot volume |
/pmix/audio/{n}/mute |
int 0/1 | Set slot mute state |
/pmix/audio/{n}/afv |
int 0/1 | Set audio-follow-video |
/pmix/audio/{n}/boost |
float | Set gain boost (0, 6, or 12 dB) |
/pmix/audio/master/volume |
float 0–1 | Set master volume |
See OSC Remote Control for the full command reference.