In addition to enabling you to control the volume of "multiple" audio devices from your menu bar...

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But what happens if you like the IBM Model M style of keyboards, without custom volume keys. Well PTHVolume 2 comes to your rescue, you can set keyboard shortcuts for any and all volume devices.

PTHVolume

The new Great Equalizer is the SEND button.

In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire