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eqMac - System Audio Equalizer and App Volume Mixer for macOS
System Audio Equalizer for Apple macOS (OS X) System. Professional grade Parametric EQ with Unlimited Bands, Volume Mixer (per Application volume control), Spatial Audio (Reverb effect). The last and only tool you will need for your Mac.
Create an Equalizer for All Audio in Mac OS X (Example)
https://coderwall.com/p/dn0v-g/create-an-equalizer-for-all-audio-in-mac-os-x
Set Up a Universal Audio Equalizer for Mac OS X Set System Volume to the maximum level, do this either through the menu bar or by hitting the Volume Up key repeatedly. Open System Preferences from the Apple menu and select the "Sound" panel, followed by the "Output" tab. Select "Soundflower (2ch)" from the Output list.
5 Ways to Apply an Equalizer to Your Music in macOS - …
https://www.maketecheasier.com/apply-equalizer-macos/
Create an Equalizer for All Audio in Mac OS X
https://osxdaily.com/2012/05/18/equalizer-for-all-audio-mac-os-x/
System-Supplied Audio Units in OS X - Apple Inc.
https://developer.apple.com/library/archive/documentation/MusicAudio/Conceptual/CoreAudioOverview/SystemAudioUnits/SystemAudioUnits.html
System-Supplied Audio Units in OS X. The tables in this appendix list the audio units that ship with OS X v10.5, grouped by Component Manager type. The Component Manager manufacturer identifier for all these units is kAudioUnitManufacturer_Apple.
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