NewTek 3Play 820 - Manual (Page 156)

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If playback* is underway, selecting a Speed Preset changes the play rate the selected speed.
Otherwise, they establish the speed for the next playback operation.
* Live throughput is always 100% Speed; if recording is enabled, selecting
a lesser Speed value initiates Delayed playback.
Thus selecting an event and setting Speed to 50% does not begin slow motion play immediately;
but when you subsequently engage Play the clip runs at half the normal rate. However, Speed
changes you make during playback of either delayed video or recorded clips are applied
immediately. This means that you can adjust playback speed on the fly in these cases by clicking
a Speed button in the Dashboard.
When newly selected, these buttons override the current T-Bar setting, setting the rate to the
indicated speed. If the T-Bar is moved it reasserts control.
14.3 OUTPUT MODE
Figure 131
Just as for the Speed buttons, the A, B and A + B buttons can stand in for their equivalents on the
control surface. They operate just like the Output Mode buttons, and also show the current state
of those controls. See Section 11.1 for more information about Output Modes.
14.4 LIVE MODE
Figure 132
In a departure from the control surface, the only Control Mode button provided in the Dashboard
is LIVE. Clicking this button has the same result as pushing the LIVE button on the control
surface.