(Avid HDX, Pro Tools|HD, and HD Native Systems with a SYNC Peripheral Only)
The controls in the SYNC Setup section of the Session Setup window let you configure SYNC peripheral settings, including clock reference, positional reference, video reference format, video input format, and Variable Speed Override (VSO).
This menu lets you set the Pro Tools clock reference.
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When using a Synchronization peripheral, the Clock Reference selector lists all supported clock types for the Synchronization peripheral.
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When using Avid HDX, Pro Tools|HD, or HD Native systems without a Synchronization peripheral, choices include any currently-enabled digital format or source available from your Pro Tools|HD I/O (such as AES, S/PDIF, or 1x Word arriving at the Avid HD audio interface’s Word Clock In port).
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Sets the timecode source for Pro Tools to use for positional reference.
Sets the video reference format for a Synchronization peripheral.
Indicates the expected format at the Video In connector on a Synchronization peripheral. At certain HD rates, a pop-up menu is provided for selecting a format.
Requires a Synchronization peripheral. When a Synchronization peripheral is connected to an Avid HDX, HD Native, or Pro Tools|HD system, the VSO controls are located in the SYNC Setup section of the Session Setup window.
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When using Varispeed with HD MADI, it is possible to exceed the available bandwidth. When Varispeed exceeds the maximum frequency for the current nominal sample rate, audio drops out. The maximum frequency for Varispeed at each nominal sample rate is listed in the following table.
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Nominal sample rate
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Channel Count
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Maximum Frequency
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The Ref Present, Locked, and Speed Cal indicators in the SYNC Setup section of the Session Setup window display synchronization status of the SYNC peripheral. The Locked and Speed Cal indicators reflect the state of the same LEDs on the front panel.
The Ref Present indicator lights when the Video Ref In connector is receiving a valid video signal.
The Locked indicator lights solid green when the SYNC peripheral is locked to the selected clock reference. The Locked indicator flashes yellow if the selected clock reference source is missing or out of lockable frequency range.
This indicator shows the status of the incoming clock reference:, depending on the type of SYNC peripheral you are using:
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Lit: SYNC I/O is locked and the clock reference is within 0.025% of the expected rate
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Flashing fast: SYNC I/O is locked but the clock reference is more than 0.025% faster than the expected rate
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Flashing slow: SYNC I/O is locked but the clock reference is more than 0.025% slower than the expected rate
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Unlit: Clock reference is not within 0.025% of the expected rate
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SYNC HD
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Yellow Solid: SYNC HD is locked and the clock reference is within 0.025% of the expected rate
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Yellow Flashing Fast: SYNC HD is locked but the clock reference is between 0.025% and 4% faster than the expected rate
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Yellow Flashing Slow: SYNC HD is locked but the clock reference is between 0.025% and 4% slower than the expected rate
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Red Flashing Fast: SYNC HD is locked but the clock reference is more than 4% faster than the expected rate
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Red Flashing Slow: SYNC HD is locked but the clock reference is more than 4% slower than the expected rate
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Unlit: SYNC HD is not locked to the chosen clock reference
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