Electronic Theatre Controls Express 24/48 User Manual download pdf (Page 31)

24 User Manual Supplement - Expression/Express consoles

LTP Channels

Introduction

Lighting consoles generally take one of two different approaches to con-

trolling lights and other devices, and both are implemented by ETC in its

Expression and Insight console lines. Beginning with version 3.0 software,

channel levels can be set so that when competing level instructions are

given, either the Highest Takes Precedence (HTP) or the Latest Takes Pre-

cedence (LTP), depending upon user control. The only exception is that

submaster control is always HTP.

When more than one instruction is given to change channel level, such as

an interrupting cue or during SMPTE control, some rule must govern

which instruction will be obeyed and where the fade occurs. The rule for

an HTP channel is that the channel fades to the highest of the two com-

peting levels and takes place in a physical fader. For Expression LTP chan-

nels, the rule is that the channel fades to the latest of the two competing

levels, and the fade can be either in a physical fader (in the foreground) or

in a background fader. Each LTP channel has its own background fader.

The determination as to whether an LTP channel fades in the foreground

or background depends upon whether the channel moves to a new level

in the next cue. If a move occurs, the fade begins in the foreground. If

there is no move, the fade continues in the background. A cue continues

to run in Expression as long as at least one of its LTP channels is still fading

in the background, and many cues can be running in the background at

once.

As an example, consider three cues that share the same LTP channels,

C1-C3, and the channels have the percentage levels given in the following

table.

C1 C2 C3

Cue 1 25 0 0

Cue 2 25 50 0

Cue 3 50 50 50

• When Cue 1 starts, C1 starts fading to level 25 with Cue 1 timing.

• If Cue 2 starts before Cue 1 ends, C1 continues fading in the back-

ground with Cue 1 timing and C2 starts fading in the foreground to

level 50 with Cue 2 timing.

• If Cue 3 starts before Cue 2 ends, C1 and C3 start fading in the fore-

ground to level 50 with Cue 3 timing; C2 continues fading in the back-

ground with Cue 2 timing.

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Electronic Theatre Controls Express 24/48 User Manual Page 31