Volume control suggestion for BigBox

[Former user]

It would be handy to be able to control the OS volume level from within Bigbox. When I'm playing the countertop cabinet at night, I turn the volume down and have to find the keyboard that I try to keep hidden to change the volume, then put it away again. For those with cabinets, it would be handy to have a Bigbox control for that.

[Brad Cheyne]

Duplicate of #245.