Open Volume pop-up: V
Turn Volume up: +/=
Turn Volume Down: -
Can be combined with the volume meter: https://github.com/tin2tin/volume_meter
Volume Menu for the Blender Video Sequence Editor. Blender Video Sequence Editor (VSE).
Python
Open Volume pop-up: V
Turn Volume up: +/=
Turn Volume Down: -
Can be combined with the volume meter: https://github.com/tin2tin/volume_meter