Interpret volume CC on the PCCH as synth-wide Master Volume

[probonopd]

The synth-wide Master Volume is exposed only as MIDI SysEx but not as MIDI CC if I am not mistaken.

Hence, we should interpret volume MIDI CC on the PCCH (performance change channel; if it is enabled) as requests to change the synth-wide Master Volume.

Then we could directly change the master volume with the slider from a MIDI keyboard.
It's obviously a slight misuse of the original function, but with PCCH=off, it would return to normal operation.

As @Banana71 said,

MIDI CC 07 (Volume) MIDI channel=PCCH then "Master Volume" 😄

Reference:

• General/master volume : how to set a value (from build 02-May-2025 i think) #920 (comment)