Volume adjustment for live players and disable patch selection

When playing live the relative perception of volume in different scenes can be too loud/quiet depending on the room/other instruments.

Allow an option for the up/down foot switches to be assigned to the output volume of an output/outputs.

Instead of selecting presets the up down switches could be used to fine tune scene volume with footswitches (and the rotary up should adjust too) which should be remembered by that scene. Allowing easy tweaking of overall scene volumes when playing live.