audio clock allows to interpret external audio timecode LTC of a configured Audio Input Device.
Go check the Clock Device
topic to see how to bind a timeline to a clock
To set an Audio Clock, go inside > Preferences > Engine > Clock Inputs or press "F11". Add a device and the choose an Audio Clock:
Then go configure an Audio Device
to get an audio Input.
If you get seeking issues in your timeline, it probably is a buffer / signal issue. First check that you receive a clear signal (green arrow).
If the issue remain, edit your devices (1) and try to increase the sample rate and buffer size using the menu presets (2):
Not that you also have acces to a "manual override" inside the device panel, this will allow to pass this clock into a Manual Clock
which will override the audio signal.