* include Mixbus PRE plugin on Mixbusses
* Mixbus master-assign on right-most "S" button
* fix parameter-banking and assignment
* fix typo in 029e963fb (fader range constaint)
In case of VCA masters or otherwise the value can exceed the max
+6dB and internal_to_interface() returns a value > 1.0 which cannot
be represented on the physical fader (MIDI &0x7f wraps)