Better keyboard shortcut for micro volume adjustments (Mac)

I have a amplifier connected to my MacBook Pro, for playing music. Because of the amplifier, the normal volume adjustment steps are often too large.

Fortunately, the following keystrokes natively allow the volume to be adjusted in smaller increments, by 1/3 step, rather than a full step:

Option+Shift+F12 (volume up)
Option+Shift+F11 (volume down)

This combination of keys, however, is very awkward. So I would like something simpler, like:

Control+F12 (volume up)
Control+F11 (volume down)

But I cannot find a way to do this with the macOS Keyboard Shortcuts feature.

And so I am using Keyboard Maestro, on a trial basis, to see if it can accommodate what I want. But here, too, I seem unable to map these keystrokes: When I press the keys, they are executed by the OS rather than recorded by the app, as my desired action.

What steps should I take, to do this?

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Learn Karabiner-Elements, the BEST companion of Keyboard Maestro.

Every key is configurable by KE, and then can be recognized by KM.

Unless I'm missing some requirement, all you need to do is set up two macros, each one triggered with your desired up/down key combination. Inside each, you just need a Simulate Keystroke action that triggers the fine volume adjustment.

For example: