Topics covered in this article:
- Using a synchronization peripheral to generate Longitudinal Time Code (LTC)
- Using the Dolby LTC Generator plug-in
When mastering, the Dolby Atmos Renderer chases the DAW transport. When the Renderer is running on a dedicated workstation, the synchronization source is LTC. When the Renderer is running on the same workstation as the DAW, the synchronization source is either LTC, or system synchronization when using the Send/Return plug-ins (Pro Tools Ultimate only).
In all cases, the timecode rate of the session as set in the Session Setup window must match the frame rate set in the Renderer Preferences Driver page, or the loaded Master File.
Using Avid SYNC HD to Generate LTC
To use the AVID SYNC HD to generate LTC:
- Enable the SYNC HD in Setup > Peripherals > Synchronization and select LTC in the Transport section.
- Enable the SYNC HD in Setup > Peripherals > Synchronization and select GEN LTC in the Transport window. If GEN LTC is not visible, click the drop-down arrow at the top right of the Transport window and check the box to show the Synchronization view.
Using the Dolby LTC Generator Plug-In
The Dolby LTC Generator plug-in can be used for both the external and internal Renderer use cases. As the LTC Generator plug-in is provided as AU and VST3 (Mac only) in addition to AAX, it can be used with a variety or DAWs. To use the Dolby LTC Generator, insert the plug-in on a mono track and set the output to a dedicated bus. Depending on the configuration, this bus should be mapped to output 128 for use with an external Renderer or 129 for use with an internal Renderer. Note that when using LTC over Audio assigned to 128, Renderer input 128 is not available for Bed or Object audio.
The LTC Generator plug-in requires the timecode rate to be set prior to use and will follow the session/project transport.
Note that some DAWs such as Nuendo and Resolve have onboard LTC generators which can be mapped to the appropriate output.