Check out the Keystroke Commands - Hot Keys section of our online manual for all hotkeys available.
https://www.pgmusic.com/manuals/bbw2023full/chapter15.htm#keystroke-commands-hot-keys

I think the ones you're looking for are:

Ctrl+Shift+Q / W
Decrease/increase current track’s volume by 5.

Ctrl+Shift+E / R
Decrease/increase current track’s panning by 5.

Ctrl+Shift+T / Y
Decrease/increase current track’s reverb by 5.

Ctrl+Alt+Shift+R
Set current track’s volume.

Ctrl+Alt+A
Decrease master volume by 5.

Ctrl+Alt+S
Increase master volume by 5.

Ctrl+Alt+D
Set master volume.

Ctrl+Alt+Shift+Q
Reduce all tracks’ volumes by 5.

Ctrl+Alt+Shift+W
Increase all tracks’ volumes by 5.

Ctrl+Alt+Shift+E
Set all tracks’ volumes.

-Callie