Specifications

212 Chapter 12 Tasks and Expressions
Stopping an Auxiliary Timeline An auxiliary timeline will stop automatically after playing to its end.
◆ HINT: Set the length of an auxiliary timeline using the Timeline Settings
command on the Timeline menu while the auxiliary timeline’s window is
active.
Alternatively, use a Control cue (either on the timeline itself, or on another time-
line) to stop it. When stopped, its images will disappear from the stage.
EXPRESSION An expression is a simple mathematical formula, combining values such as
inputs and numeric constants using operators in a way that yields a numeric
result. Expressions are used to:
• Start tasks, as described on page 211 and under “Triggering Tasks” on
page 203.
• Influence tween tacks (see “Controlling Tween Tracks” on page 202).
In its most basic form, an expression consists of a single value, such as an input
(this example assumes that an input with the name “ModWheel” exists in the
Input window – see “MIDI Controller Input” on page 198):
ModWheel
If this expression is used in the Trigger column of the Task window, that task will
be started when the ModWheel’s value becomes non-zero (that is, when the
modulation wheel on the attached MIDI device is moved from its zero position).
Likewise, if this expression is used as a formula for an Opacity tween track, the
opacity will be controlled only by the modulation wheel (that is, the value of the
tween track itself will have no effect).