This is being posted on behalf of Torpid over on Steam: There needs to be a way to adjust volume from the keyboard instead of just in Settings.xml (I’d personally suggest F5 and F6 for the job).
I thought some of the F-keys already did that? Or was that just master volume?
F7 and F8 control volume, according to keyboard mapping topic at the forum.
Yes, F7 and F8 control volume; this should become clearer once the keyboard mapping UI is released.
Reopening. The intent was to specifically control just the music volume, not the master volume for the whole game.
F7/F8 works great for sound effects but music is still quite loud. Only way I found to adjust with settings.xml file, thanks to AssumedPseudonym. Over speakers its not very noticeable but over headphones is quite loud.