One of the challenges we faced during The Ascent was dynamically and remotely controlling an ETC ION Light Board via a MIDI Show Control Gateway. We approached this using Max.
The ION Light Board supports a number of different MSC commands outlined here.
For our implementation we originally wished to use 'Set Submaster' commands to control our lighting environment, however we found that the lighting board, for a reason we are as of yet unable to verify, was unable to process these commands. As an alternative we decided to stick to 'Go Cue' and 'Fire Macro' commands.