Sync mode
If you activate “Use External Synchronization” on the Transport menu, the following happens:
Cubase Pro only: Transport commands are routed to the machine control destination output as specified in the Project Synchronization Setup dialog.
Locate, Play, Stop, and Record commands will now be sent to an external device.
Cubase awaits incoming timecode from the chosen timecode source defined in the Project Synchronization Setup dialog in order to play.
Cubase will detect incoming timecode, locate to its current position, and start playback in sync with the incoming timecode.
Cubase Pro only: In a typical scenario, an external tape machine (e. g. a VTR) has its timecode output connected to Cubase. Cubase is sending machine control commands to the deck. When Sync is activated and you click Play on the Transport panel, a play command is sent to the VTR. The VTR in turn starts playback, sending timecode back to Cubase. Cubase then synchronizes to that incoming timecode.