ETC Cobalt Family v7.0.0 - Manual (Page 1015)

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The Controller numbers used in Cobalt are:
Fader Value
Master 1 00 00
Master 2 01 00
Master 3 02 00
...
Master 39 26 00
Master 40 27 00
Grandmaster 7E 03
Examples
Master 1 at 100%
F0 7F 01 02 01 06 00 00 7F 7F F7
Master 20 at 50%
F0 7F 01 02 01 06 13 00 00 40 F7
Master 33 at 0%
F0 7F 01 02 01 06 20 00 00 00 F7
Grandmaster at 20%
F0 7F 01 02 01 06 7E 03 7F 19 F7
NOTE
For more info about MIDI, MSC and other Show Control commands a good
book to have is Control Systems for Live Entertainment by John Huntington
(ISBN: 978-0-240-80937-3)