Datavideo SE-4000 8-Channel 4K Video Switcher - Manual (Page 71)

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Audio XPT
The Audio XPT feature allows the user to associate the audio component of any input source
to any of the input buttons (1 – 8), thus cross assigning audio input channels to
program/preview row buttons.
Available options are listed as follows:

Input 1-8

External

Follow
“External” selects audio source from AUDIO IN ports.