How to Lower Slack Volume on Mac Without Lowering Other Apps
Slack notifications too loud during meetings? Learn how to independently control Slack's volume on Mac without muting everything else — including the 'knock-brush' notification sound.
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Quick Fix: Lower Slack Notification Volume on Mac
- 1Click the OddMac Volume Mixer icon in your Mac menu bar.
- 2Locate 'Slack' in the list of active audio applications.
- 3Drag the Slack slider left to reduce its volume (or set to 0% to mute notifications entirely).
- 4Slack notification sounds are now quieter — Zoom, Spotify, and all other apps are unaffected.
Slack does not expose a system-level volume slider. Its notification sounds play at whatever your Mac's master volume is set to. When you're on headphones during a Zoom call with master volume at 70%, a Slack 'knock-brush' can be startlingly loud.
Slack's Built-In Notification Sound Settings
- 1Open Slack and press Cmd + , to open Preferences.
- 2Click 'Notifications' in the left sidebar.
- 3Under 'Notification Sound & Appearance', choose a quieter sound or set to 'None'.
- 4Note: this controls the sound type only — the actual volume level follows your Mac master volume.
Setting Slack notifications to 'None' silences all notification sounds permanently. If you want notifications at a lower — not zero — volume relative to other apps, a per-app mixer is the only solution.
Muting Slack Completely on Mac
- OddMac Volume Mixer: click the mute icon next to Slack to silence all Slack audio instantly, even mid-call.
- Slack Do Not Disturb: click your profile icon > Pause Notifications — this stops new notifications but does not mute existing sounds.
- Mac Focus Mode: turn on Focus mode (Control Center > Focus) to silence all non-priority notifications system-wide.
Stop Slack notifications from blasting through your headphones
Per-app volume control for Slack, Zoom, and every Mac app. No drivers needed.
Try OddMac Volume Mixer →Frequently Asked Questions
Why can't I adjust Slack's volume independently on Mac?
macOS does not include a native per-app volume mixer. Slack's notification sounds play at your system master volume. The only way to adjust Slack's volume independently from other apps is with a third-party volume mixer like OddMac.
How do I mute Slack notifications on Mac without turning them off?
Use OddMac Volume Mixer to set Slack's individual volume to a low level (10–20%) rather than muting it completely. This keeps notifications audible but not disruptive during meetings.
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