The Sony Venice is well equipped for timecode synchronization with file timecode, which basically every editing software can read and process. The FX9 has a dedicated timecode BNC input (TC IN) on the right back. So connect a synchronized Tentacle Sync ORIGINAL or SYNC E device via cable to the TC port of the camera and set the camera frame rate and TC menu accordingly. "Ext-LK" will appear in the camera display when timecode is locked.
Menu settings for the Sony FX9:
TC/Media > Timecode > Mode: Preset > Run: Free Run
TC/Media > TC Display > Display Select: Timecode
Use one of these cables with your SYNC E and the Sony FX6:
You can get this cable as well at one of your local dealers