ETC Congo Family v6.4.0 - Manual (Page 418)

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Sequences - Build & Modify Modes (6.3)
There are two modes that affect recording and playback of Sequences. Build Sequence and
Modify Sequence.
The fastest way to toggle them on/off is with the context menu (right-click) on the header of
the Playback Tab (6.3).
Both can be set in System Settings as well. See
System Settings - Crossfade .