ETC Congo Family v6.4.0 - Manual (Page 813)

811
If there is content in a master field, you will get a dialogue for overwriting:
Drag and Drop Master Links (6.3)
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 .