In Sound Forge Pro (10 thru 13), "View> Hardware Meters" (Key shortcut: Alt.+ 7 or Alt.+ Num 7). Not sure about Sound Forge Audio Studio (AS).
A handy third-party app is NirSoft's Volumouse, which allows controlling the sound card's volume with the Alt. key + mouse wheel or other user options.
Not sure if it is specific to Dell PCs or Win 10 in general, but Function keys F2, F3 & F4 can mute, decrease or increase volume.