Plug
Every sound your Mac plays, through your Audio Units.
Plug sits between your apps and your speakers. Pick everything or just the apps you want, run them through any Audio Unit effect on your Mac, and send the result to the output you choose.
Free. Needs macOS 14.2 or later.
Drag the knob up or down. The bent tack marks 0 dB, and above it Plug boosts up to +10 dB, just like the real one.
Where Plug sits
What it does
System audio or chosen apps
Process everything, or tick only the apps you want. The rest play normally.
Any Audio Unit effect
Apple's built-in effects and your third-party plugins, each with its own controls window.
A chain you can rearrange
Drag effects into order and bypass any of them without losing its settings.
A master with headroom
From silence to +10 dB, with 0 dB marked by a bent tack. Link it to a MIDI knob in two clicks.
Presets
Save the whole setup (input, apps, output, effects and level) and switch in one click.
Always within reach
Start, stop and set the level from the Dock icon or the menu bar, where you can also add your own buttons that send MIDI, run scripts and Shortcuts, or ask Claude.
Install in a minute
- Open the Plug disk image and drag Plug onto Applications.
- The first time, right-click Plug in Applications and choose Open, then Open again.
- Press START and allow System Audio Recording when macOS asks.