Keyboard Shortcut to change specific program's volume in Windows

Question

I was looking for a way to quickly change the volume to only one program, probably the active window, using a keyboard shortcut. I can do this manually with the Windows Volume Mixer, but I'm looked for a quicker way to do it.

Solution

Nircmd's setappvolume, changeappvolume and muteappvolume commands are what you want.

You can create shortcuts to nircmd.exe, set keyboard shortcuts and add the following to the shortcut properties' Target fields:

setappvolume focused <volume level>
changeappvolume focused <volume level>
muteappvolume focused <mute mode>

where:

volume level is a number between 0 and 1 and stands for the percentage of change
(for changeappvolume it can be positive or negative)

mute mode is either 0 (= unmute), 1 (= mute) or 2 (= toggle between mute and unmute)