Datavideo SE-4000 8-Channel 4K Video Switcher - Manual (Page 32)

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3.7 Cross Point
The Cross Point function allows the user to shuffle contents of Inputs 1 – 8 without changing
physical connections at the back of the machine.
First select an input channel then tap Video XPT or Audio XPT to set the respective sources.
In Audio XPT, if “FOL.” is selected, the audio will enter Audio follow Video mode, i.e. playback
of the audio of the output video without audio output delay. If “EXT.” is selected, the external
audio, i.e. audio from AUDIO IN port, will be played.
In Audio Setting, you will be allowed to adjust audio gain and delay.