Sound Control by Static Z Software
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Per-App Volume Controls
Control the volume of your apps independently.
Opt-in apps to the system wide EQ with built-in and custom presets.
Reroute app audio to any audio output device.
Send iTunes to an external USB device while the rest of your apps use your MacBook’s internal speakers.
Add keyboard volume controls, to DisplayPort monitors, HDMI TV & Receivers, and other devices missing them.
New in 2.1.0, Sound Control adds keyboard volume controls to aggregate and multi-output devices!
Full Hotkey Control
Set up hotkeys to control volume, mute and EQ for the foreground app. There is even a hotkey to mute all background apps.
All features are fully supported on macOS 10.9 – 10.13, including macOS High Sierra.