Chapter 6: Using Pro Tools | Sync X 26
Chapter 6: Using Pro Tools | Sync X
Clock References
The following sections explain various clock reference configurations. Active outputs from Sync X are always synchronous with
the selected clock source (internal or external).
Internal Clock
Pro Tools | Sync X can use its own internal clock as the Clock Reference Source. Sync X uses a double resolution JetPLL™ Clock
with extremely low jitter.
To resolve Sync X to its own internal clock:
In the Pro Tools Session Setup window, select Internal as the Clock Reference Source.
VSO (Variable Speed Override)
To fine-tune the playback speed (and pitch) of Pro Tools and any device receiving Clock Reference from the Sync X internal clock,
you can varispeed the rate of the internal clock. If generating timecode while using VSO, the frame rate of the generated LTC/MTC
is varied proportionally to the sample rate and pitch change. VSO is available at any Positional Reference setting.
To varispeed the Sync X internal clock:
1 In the Pro Tools Session Setup window, select Internal as the Clock Reference Source.
2 Enable the VSO option.
3 Adjust the varispeed value using the slider. The varispeed value is displayed to the right of the slider in semitones and cents
(0.00).
Sync X only outputs sample rates within the varispeed limits of the current sample rate. If a varispeed value results in an output fre-
quency (sample rate) that is below or above the limits for the current sample rate, the
Clock Ref Status indicator flashes red.
With Loop Sync I/O, Sync X supports the following VSO ranges:
At 44.1 kHz/48 kHz
40.0 kHz (Min) to 50.5 kHz (Max)
At 88.2 kHz/96 kHz
80.0 kHz (Min) to 101.0 kHz (Max)
At 176.4 kHz/192 kHz
160.0 kHz (Min) to 202.0 kHz (Max)
Video Reference
To resolve Sync X to external video reference:
1 Connect the video reference output signal to the VIDEO REF IN BNC port on Sync X.
2 If applicable, connect one or both of the VIDEO REF OUT BNC ports to the video reference input of other receiving devices.
3 In the Pro Tools Session Setup window, select Video Reference as the Clock Reference Source.
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