You're listening to music on your Mac. A Zoom call starts. You scramble to pause Spotify or lower the volume so you can hear the meeting. The call ends. You raise the music back up. This happens five times a day, and every time it's a manual interruption. Audio ducking — automatically lowering background audio when a priority source plays — is standard in broadcast and streaming. On macOS, it doesn't exist natively.
What audio ducking actually does
Ducking is simple: when a designated priority audio source becomes active, all other audio sources lower their volume by a set amount. When the priority source stops, everything rises back to its original level. Broadcasters use this so a host's voice always sits above background music. Streamers use it so game audio dips when they speak.
On macOS, the closest built-in behavior is the accessibility setting that can reduce background audio during VoiceOver announcements. But that's specifically for VoiceOver — there's no general-purpose ducking for calls, voice chat, or any arbitrary app.
Setting up auto-ducking with SoundDial
SoundDial includes automatic audio ducking as a built-in feature. You designate which app should trigger ducking — typically a communication app — and everything else lowers automatically when that app produces audio.
Common ducking setups
- Zoom / Google Meet / FaceTime as priority: music, browser, and other apps duck when a call is active. Your meeting voice is always clear without manual volume changes.
- Discord as priority: game audio and music lower when teammates speak. Callouts are never lost under explosions or a loud soundtrack.
- Podcast recording: everything ducks when your DAW's input is active, keeping your monitoring environment clean.
How it feels in practice
The transition is smooth — background audio fades down when the priority app plays, then fades back up when it stops. You stop noticing it after the first hour because it's doing exactly what you were doing manually, just without the interruption. No more reaching for sliders mid-conversation.
Combined with per-app volume and profiles, ducking completes the picture: your apps already start at the right levels, and ducking handles the dynamic adjustments throughout the day.
Get SoundDial on the Mac App Store — €14.99 one-time purchase, no subscription, macOS 14.2+.