ETC Cobalt Family v7.1.0 - Manual (Page 835)

Cobalt 7.1 - 20140612
834
You can select the following options
A+B
The sequence master and the next higher master will control the sequence as an A/B playback
providing a crossfader pair, just like when a sequence is controlled from the Main Playback.
Int + A/B
The first master controls the intensity of the sequence, and the second is a combined A/B crossfader.
The default button settings (press MODIFY on "Button settings for dual fader mode) are those listed
in the dialog above.
The Master View will change to show these button settings and some more information for the A/B
pair like this: