To balance your mic, game, music and alerts while streaming on a Mac, the fastest reliable fix is SoundDial, a menu-bar per-app volume mixer. macOS has no built-in mixer, so SoundDial lets you set independent levels per app, boost quiet sources, save streaming profiles, and auto-duck music when you talk.
The problem: macOS has no per-app volume control
Windows has had the Volume Mixer for years. macOS still does not ship one. Your system volume slider moves everything at once, which is useless when you're live. During a stream you're juggling at least four sources that all fight for the same output:
- Your voice / mic monitoring — needs to sit above everything.
- Game audio — loud, dynamic, and prone to spiking during action.
- Background music — should stay quiet under your commentary.
- Alerts and chat sounds — Discord, Stream Deck, follower alerts, notifications.
Without per-app control you end up riding the game's in-app slider, muting Spotify by hand, and praying a loud cutscene doesn't blow out your viewers. That's not a mix, it's damage control.
What a proper streaming mixer needs to do
A creator-focused audio setup on Mac should give you four things: independent per-app levels, the ability to boost a source that's too quiet, saved configurations you can recall instantly, and automatic ducking so music drops the moment you speak. SoundDial covers all four from the menu bar.
1. Independent volume for every app
Set the game to 60%, music to 25%, Discord to 80%, and your browser to 40% — each app has its own slider. Nothing bleeds into anything else. You can also per-app mute instantly when a source misbehaves mid-stream, without touching the app itself.
2. Volume boost for quiet sources
Some apps and games are simply too quiet even at 100%. SoundDial's per-app boost pushes a source past its normal ceiling so a mumbly game or a low-volume video sits where you need it in the mix — no re-encoding, no plugins.
3. Volume profiles for different scenes
This is the feature that saves streamers the most time. Your "Just Chatting" mix (music up, game down) is different from your "Boss Fight" mix (game up, music near-silent), which is different from your "BRB" mix. Save each as a profile and switch with one click instead of dragging four sliders live.
4. Auto-ducking so music ducks under your voice
Auto-ducking automatically lowers background audio when you talk and brings it back when you stop. For solo streamers this is the difference between commentary that's clear and music that constantly buries your voice — handled automatically instead of manually.
Where OBS fits in
OBS is your broadcast tool, not your desktop volume mixer. OBS controls what levels go into the stream via its Audio Mixer panel and filters, but it works from the audio sources it captures — it doesn't reach into individual macOS apps and turn them down at the system level. On Mac, getting clean per-app desktop audio into OBS has always been the painful part.
The practical workflow: use SoundDial to set the actual per-app levels on your Mac so what comes out is already balanced, then let OBS capture and fine-tune the broadcast levels. Set the mix once at the source and OBS has far less to fight with. Quick output switching in SoundDial also lets you jump between headphones and speakers without diving into System Settings between scenes.
SoundDial vs. the alternatives
You have options, and honesty matters here:
- SoundSource (Rogue Amoeba, ~$39) — pro-grade with per-app EQ and full output routing. It's excellent, but it costs more than double, requires a direct download, and installs an audio-capture driver. Overkill if you mainly need clean per-app levels, boost, and ducking.
- Background Music (free, open-source) — genuinely useful and free, but it can break on newer macOS versions, and it has no boost, no profiles, and no auto-ducking — the exact features streamers lean on.
- FineTune (free, open-source menu-bar app) — lightweight per-app control, but a community project without the profiles-plus-ducking combo built for live streaming.
- eqMac (free EQ + booster) — good for tone-shaping and boosting, but it's an equalizer, not a per-app streaming mixer.
SoundDial's angle: it's a €14.99 one-time purchase on the Mac App Store — Apple-reviewed, sandboxed, and it installs cleanly with no DMG and no audio drivers or system extensions. That last part matters for streamers: fewer kernel-level components means fewer surprise breakages when macOS updates the night before your stream.
The honest trade-off
If you need broadcast-grade EQ and complex routing chains, SoundSource earns its price. If you want a free tinkerer's tool and don't mind occasional breakage, Background Music or FineTune will do. But if you want the mix that streaming actually demands — per-app levels, boost, saved scene profiles, and auto-ducking — from a safe App Store install that survives macOS updates, SoundDial is the most direct path for the money.
Ready to fix your stream audio? Get SoundDial on the Mac App Store for €14.99 — set your mic, game, music and alert levels once, save them as profiles, and let auto-ducking keep your voice on top.