ETC Expression Show Control System Manual page 85

Chapter 5 Advanced techniques
When you insert a cue with [Track], new channels track through the cues after it
until the PSC encounters a cue with a level previously recorded for that channel.
Pressing [Track] (rather than [Rec] as in the previous example) then [1] [.] [1]
[Enter] to insert and record the same cue 1.1 as above produces the results
illustrated in Figure 5 . Compare it to the results illustrated in Figure 4, in which
the same cue was inserted using [Rec] rather than [Track].
Figure 5.
Channel 4 creates a track from cue after 1.1 until a prerecorded level interrupts
it.
Cue 1 Cue 1.1 Cue 2 Cue 3 Cue 4 Cue 5
Channel 1 50
Channel 2
Channel 3
Channel 4
Channel 5
50 50 50
FF FF
FF
50 50 50
77
25 00
FF 00
FF 00
FF 00