DigiDesign Mbox 2 Academic, Getting Started Manual

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Chapter 8: Time Code and Synchronization Features 59
Since Pro Tools Academic does not have any
means to adjust the Pro Tools sample clock, it
instead simulates the audio/video pull relation-
ship by pulling up the video instead of pulling
down the audio. This maintains the proper
video/audio speed relationship when using the
fixed Pro Tools internal clock. The audio sample
clock is not pulled down, so the digital outputs
are not outputting a pulled down sample clock.
If you are using an external clocking source
(such as S/PDIF or ADAT Optical), Pro Tools au-
dio and MIDI are resolved to the digital input’s
clock speed. If you select audio pull down, the
audio still doesn’t pull down in Pro Tools Aca-
demic; the video still pulls up to maintain the
proper relationship, and the actual Pro Tools
sample rate is now dependent on the digital
clock source. However, if the incoming digital
clock speed is
pulled down , Pro Tools audio and
MIDI will run at a pulled down rate, and the
video will play back at its normal speed.
When pull down is selected in Pro Tools Aca-
demic, the following occurs:
• If the external clock is not pulled down, the
actual sample rate of Pro Tools Academic
audio and MIDI is not pulled down, but the
video is pulled up.
• If the external clock is pulled down, the ac-
tual sample rate of Pro Tools Academic au-
dio and MIDI is pulled down, and the video
plays at its original non-pulled speed.
Import Session Data
Enhancements
This section provides information on Pro Tools
Academic’s Import Session Data features that
are not included with Pro Tools LE or M-Pow-
ered.
Time Code Mapping Options
You can specify where the imported tracks are
placed in the current session. Times are indi-
cated in time code for Pro Tools|HD, Pro Tools
Academic, and Pro Tools LE with DV Toolkit 2
systems, and minutes:seconds for standard
Pro Tools LE and M-Powered systems.
From the Import Session Data dialog, the fol-
lowing Import Mapping Options are available:
Maintain Absolute Time Code Values
This option
places tracks at the locations where they were lo-
cated in the source session. For example, if the
current session starts at 00:01:00:00, and the ses-
sion from which you are importing starts at
10:00:00:00, the earliest imported tracks can ap-
pear in your session is 9 hours and 59 minutes
after the start of the session.
Maintain Relative Time Code Values
This option
places tracks at the same offset from session start
as they had in the source session. For example, if
the source session starts at 01:00:00:00 and con-
tains a track that starts at 01:01:00:00, and the
current session start is 02:00:00:00, the track
will be placed at 02:01:00:00 in the current ses-
sion.
Map Start Time Code To
This option places
tracks relative to their original session start time.
(With Pro Tools Academic, times are expressed
in hh:mm:ss:ff.) For example, if the current ses-
sion starts at 00:01:00:00, and the session from
which you are importing starts at 10:00:00:00,
you can reset the start time code to 00:01:00:00,
to avoid placing files 9 hours and 59 minutes
from the start of your session.
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