Master Volume hotkeys

Hello again,

I would like to request adding hotkeys for turning the master audio volume up and down. Or a hotkey to bring up a small window for turning the master volume up and down.

I am using AutoHotKey for turning volume up and down in Windows - using the “Ctrl Alt +” and “Ctrl Alt -” - and it works while playing most of the games - but they don’t work while playing Grim Down.