Or add mouse-only option. By drawind a circle with your mouse (like in Magic Formation) a small tyre-like object would appear on the screen. By scrooling your mouse that object would get filled with color from right to left- more scrolling, higher volume you would get. Scroll down to set volume lower. After a couple seconds of inactivity it would dissapear ...
It could get useful for Trout also because some don't want for Trout to appear on screen at all (not even Minibar) ...
It could also have special mode for people who are disabled. There are people that just can't use keys because they can't move their fingers/arms etc. I heard of software that enables you to move a mouse just with the moving of your eyes. With eye movement they could so invoke Volt although I do not know how would they mimic scrolling to move volume up/down...
Another idea: make Volt recognize speech
. So when Volt is activated and someone says Down/Up, volume gets up/down to a certain degree.
Possibilities are endless. You just have to explore them (although my post doesn't make sense
)