ETC Cobalt Family v7.0.0 - Manual (Page 849)

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If there is content in a master field, you will get a dialogue for overwriting:
Drag and Drop Master Links
You can create a master link in a sequence by dragging the master from the master view to the
sequence step.
The master will be linked with a target level or 100% if it is over 50% when linked, and a target level
of 0% if it is under 50% when linked. You can double-click the master link in the Playback view to
edit it.
See Sequence Step Links - Master Playbacks .