pro bel TX 520 Operator's Manual page 22

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Used to manually suspend a transition set by an automation system until the
<HOLD> button is pressed again to release it. For example, if the current on-air
programme overruns its scheduled duration it may be necessary to manually
control when the next transition will be made.
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Select the required source to the PST bus.To take the transition in one step,
including pre-rolling the machine, press <PRE-ROLL & TAKE>.
The machine is started. The red PGM source buttons light after the pre-
configured ROLL time, corresponding to the sources pre-selected on PST.
The pre-roll time is displayed in the window above the <PRE-ROLL &
TAKE> button. The transition is made using the type and speed shown by
the lit transition setup buttons.
2
To abort the transition once a pre-roll has started, press the <ABORT> button
next to the countdown timer.
The transition is aborted and the pre-roll countdown timer resets. The PGM
and PST sources remain unchanged.
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