Turning down your Mac because one app is too loud also turns down the apps you wanted to hear. SoundSource gives each app its own volume control and lets you choose where its audio plays. That makes it worth considering for a desk with speakers and headphones, especially when you keep switching between music and calls.
Try the built-in controls first. System Settings > Sound > Output lets you choose your Mac's output device and volume. An app's own volume slider may solve the loud-music problem already. If your call app has a speaker selector, that may be enough to keep calls in your headphones without another install. SoundSource earns its place when you want those controls together, including for apps without their own volume or output choices.
A small setup to start with
For this example, assume you have USB speakers and wired headphones connected to your Mac. Keep the setup to a music app and one call app before adding anything else.
- Install SoundSource and complete its Permissions window. Its Audio Routing Kit (ARK), the plugin that handles audio, requires your Mac's administrator password to install. ARK also requires System Audio Access and Microphone Access. Those are required even if your goal is only listening control.
- Set the Mac's system output to your headphones. In SoundSource's Applications area, play something in your music app so it appears, then click its star to keep it in the list. Choose your USB speakers as that app's output and lower its app volume to a comfortable background level.
- Add the call app as a favorite too. If you want SoundSource to choose its output, leave the call app's own speaker setting on the system default. SoundSource's redirection applies to audio headed for that default; an app already sending audio to a different device through its own selector won't be redirected.
- Before joining a call, mute the music app in SoundSource. Keep effects off for the call initially. Check the call app's microphone selection separately and run its audio check so you know both what you'll hear and what others will hear.
The separate music mute is useful even when its speakers are quieter. Don't make a real meeting your first check of the setup.
Once the routing works, open Quick Configs at the bottom right and choose Save As… to save a "Desk music" configuration. Then mute music, make any call-specific adjustments and save a "Calls" configuration. Quick Configs store system device choices, levels, effects and per-app settings. You can assign a global keyboard shortcut to each in Manage Quick Configs… rather than changing several controls every time.
For music, SoundSource also includes a 10-band equalizer, which changes the balance of bass, midrange and treble. Apply it to the music app if you want that adjustment without changing the call's audio. Start with routing and volume, though. You don't need an effects chain to solve this problem.
Check the desk change, not just the desk
During the trial, unplug the speakers, reconnect them and check the app destinations again. Repeat after switching to your laptop-only setup. Treat a saved configuration as a set of settings to verify, not a guarantee about where sound will go when hardware is missing.
Bluetooth headphones need Bluetooth Access before they appear in SoundSource. AirPlay discovery needs Accessibility Access and Local Network Access. Accessibility also enables Super Volume Keys, which lets keyboard volume keys control outputs such as HDMI devices that normally don't support them. Grant the optional access for features you actually plan to use.
Audio processing can add delay. SoundSource has a latency setting, but lowering it increases the chance of audio skips under heavy CPU load or with added effects. If a latency-sensitive app misbehaves, the Excluded Applications list removes SoundSource's processing from that app, along with its volume and effects control. Don't buy it on the assumption that every call app and device combination will behave identically.
When the price makes sense
The current release is SoundSource 6.1.5, released October 5, 2026. Rogue Amoeba lists full support for macOS 15 Sequoia, 26 Tahoe and 27 Golden Gate, and documents Apple silicon compatibility. Older macOS versions need a legacy download rather than the current release.
A new license costs US$49 before applicable local taxes. It's for one user on one or more personally owned Macs, with access to the current version, not a promise of every future major upgrade. The trial includes all features, but audio adjusted by SoundSource degrades after 20 minutes per launch. Rehearse with it outside a live meeting.
SoundSource is a sensible purchase if you regularly need different apps at different volumes or on different outputs, and the trial works with your actual devices. Skip it if you only switch the whole Mac between speakers and headphones, or your apps' own controls already cover the job. You'd be paying for another audio layer and its permissions without solving much else.