ETC Congo Family v6.4.0 - Manual (Page 420)

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Sequences - Block Values
It is possible to set a block for all track editing functions for a step.This is done in the
Sequences List.
See Sequences - Sequence List .
See also Track - Track Editing
A block is indicated in the Playback List with a B after the Preset and a line over the step.In
this image step 7 is blocked.
NOTE
Currently all intensities are blocked. To block the intensity for an
individual channel set it to a different value from incoming or
outgoing values (like 99% or 49%).