13 - AUTOLOCATOR
Page 82 Version 2.00 - March, 1996
PRE-ROLL
The PRE-ROLL key allows you to set an offset to locate times. This offset is then added to
all locate time points you go to. For example, with a pre-roll of 3 seconds, if you locate to
00:01:00:00.0, you will actually locate to 00:00:57:00.0. Similarly, with a 3 second pre-roll,
you would locate three seconds before the IN time in the event of you pressing GOTO IN.
Similarly with GOTO OUT or SYNC. Locating to a locate memory would have the same
effect.
The principle use of PRE-ROLL is when synchronising mechanical tape players (VTRs,
MTRs, etc.) to the DD1500. Because mechanical devices need a certain amount of time
to get up to speed, it is necessary to locate to a point a few seconds before where you
really want to be so that the external devices get up to sync by the time you reach the
actual locate point.
The PRE-ROLL time is set by pressing SHIFT+PRE-ROLL(SET). You will receive this
screen:
Simply set the pre-roll time you require using the DATA ENTRY+/- keys or more directly
from the numeric keypad. If you get confused in this complicated screen, press RESET
(F6) to rest the pre-roll time to the default time of 1 second!!
When PRE-ROLL is switched on, all locates will be minus the time set here.
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