Avid Technology Digidesign USD User Manual page 50

Pro Tools Systems
Pro Tools provides controls for virtually all
USD generator controls. Instructions for
basic SMPTE or MTC generating can be
found in the Pro Tools Reference Guide. Spe-
cial instructions for any situations are in-
cluded in the following sections.
See "Control Options" on page 27 for de-
tails on the USD control access.
Generator Start Time
To set the generator start frame from
Pro Tools:
Configure the Session Setup window as
appropriate for your system and the cur-
rent project. Refer to the Pro Tools Reference
Guide for specific instructions.
To set the generator start frame from the
front panel:
Select Set Gen (SE7 6En), using the Set,
1
Down, and Up switches.
Press the Set switch again. One of the
2
time code fields displayed will be flashing.
To lower or raise the currently flashing
3
parameter press the Down or Up switch.
Hold down either switch to scroll
down/up.
To set a time code setting and advance to
4
the next field, press and release the Down
and Up switches simultaneously.
Repeat until you have finished setting
5
the USD to the desired generator start time.
46 Universal Slave Driver
When you are done, press the Set switch
again. The USD will retain the setting, even
when the unit is powered off and on again,
until it is changed.
LTC Generation/Regeneration
Regenerating LTC
The USD will regenerate LTC whenever the
external positional reference is moving at
normal, 1x forward speed (±10%).
Make sure LTC is correctly routed as ex-
plained in Chapter 2: Installing the USD. In
addition, be sure to check and adjust the
level of the USD LTC output signal, if nec-
essary. See "Example 1: Using Set, Down
and Up to adjust LTC Gain" on page 30 for
instructions. If necessary, adjust the input
level for the destination device.
To regenerate LTC using Pro Tools:
In the Session Setup window, select any
external positional reference (except Gen-
erate).
To regenerate LTC using the front panel:
Using the USD Positional Reference
switch, select the desired external posi-
tional reference (do not select Generate).
The USD regenerates LTC as soon as it re-
ceives a valid positional reference signal.
To regenerate LTC using USD Setup:
Select the desired external positional ref-
erence from the Positional Reference pop-
up (any choice except Generate).