/live/master/volume should only expect 1 parameter

[benkuper]

When sending /live/master/volume , nothing happens, but when sending /live/master/volume , the master volume is set. I think it comes from a common handling with tracks (which works with /live/track/volume ) but master track doesn't need track ID and documentation says the message contains only one float param.

The /live/master/volume feedback is also in the format with the int always equal to 0