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In addition to adjusting audio with its own built-in effects, SoundSource makes it possible for you to use Audio Unit plugins on any audio, including third-party Audio Unit plugins you've installed on your Mac. SoundSource will find Audio Units in two locations:
To use an Audio Unit with SoundSource, just install it in either of those locations. When a compatible audio effect-type Audio Unit is installed, SoundSource will include it in the menu shown when clicking “Add Effect” for either the System Output device, or a per-application adjustment.
It's worth mentioning that SoundSource does not load non-effect Audio Units, such as instruments or generators. These plugins simply don't fit with the way the app works, so we have no plans to allow their use in SoundSource.
Unfortunately, since initially releasing SoundSource 4, we've discovered that certain third-party Audio Unit plugins can cause problems. To avoid any difficulty or performance issues caused by these problematic plugins, SoundSource 4.1 and later blocks certain plugins by default:
IK Multimedia's ARC
We'll continue to evaluate these plugins in the future, to see if they're improved to the point where we feel confident offering full support for them.
We don't recommend using the above-listed plugins with SoundSource. However, if you wish, you can restore access to these plugins through SoundSource's hidden preferences.
To access this window:
1) Quit SoundSource, then relaunch it while holding down the Option key. This will bring up the debugging window (shown in the screenshot above).
2) Enable the “Show blocked third-party Audio Units” checkbox, and then click “Done”.
Once this setting is turned back on, any previously blocked third-party Audio Units will be available in SoundSource. While their use isn't officially supported, if you need to use the we hope you'll find they work for you.← SoundSource Support