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Synchronizing your gearSMPTE/MIDI time code synchronization ► Playing digital audio under SMPTE/MTC sync

Table 210.  
Audio event playback is started (or triggered) at the exact time code, but then the audio plays at its own internal rate (or freewheels). When audio freewheels, it can gradually drift from the time code due to variations in the time code signal.
The speed of audio event playback is continually adjusted to stay in sync with the time code. If the external clock drifts or changes rate, SONAR adjusts the audio playback speed to stay in sync. This adjustment may introduce slight pitch changes, but those changes will be negligible if the external clock is reasonably steady.
Some digital sound cards (such as the Frontier Design Wavecenter or the Antex Studio Card) have external clock inputs. If you are using one of these cards, and an external clock source like a digital tape deck is the master timing source for the project, choose the Trigger and Freewheel option. The clock input on the audio card guarantees that there is no drift between the time code and audio playback.
Go to Edit > Preferences > Audio - Sync and Caching.
Under Synchronization, select either Trigger & Freewheel or Full Chase Lock.

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