Specifications

Pro Tools Reference Guide554
Refer to the SYNC I/O Guide for instructions on
using VSO to varispeed Pro Tools playback.
Locked Indicator
he Locked indicator stays lit when the SYNC I/O
is locked to the selected clock reference. The
Locked indicator flashes if the selected clock ref-
erence source is missing or out of lockable fre-
quency range.
Speed Cal Indicator
Speed Cal is an indicator of the accuracy of the
incoming clock reference. The Speed Cal indica-
tor is lit when the output frequency is within
200 ppm (0.02%) of the selected sample rate.
The Speed Cal indicator turns off when the out-
put sample rate is not at the expected (or target)
rate.
Session Start Offsets
(Pro Tools 6.x Only)
Pro Tools lets you compensate for devices that
are consistently offset by a fixed number of
frames (such as some color–corrected video mas-
ters), or for material that starts at a different
time than the session.
Pro Tools provides three different types of Ses-
sion Start Time Code Offset settings. These off-
sets include:
• MMC (MIDI Machine Control)
• 9-Pin (Serial machine control)
• Synchronization peripherals (such as the
SYNC I/O, or a MIDI interface that provide
MIDI Time Code).
Positive and negative offset values can be en-
tered to offset Pro Tools time code display later
or earlier, respectively.
Unique values can be defined for each of these
three types offsets, or you can link all three to
adjust in unison.
If you are using Digidesign’s MachineControl
option, additional Session Start Offset options
are available. See the MachineControl Guide for
more information.