Datavideo SE-1200MU 6-Input Switcher and RMC-260 Controller Bundle - Manual (Page 81)

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Changing the Audio Mode option from Analog to OFF will mute the incoming XLR audio from the external
master audio mixer.
Audio Source selects the source of the audio.
The Audio sub-options for SDI and HDMI allow the user to individually turn ON/OFF the audio at the SDI 1,
SDI 2 and HDMI 1 outputs.
Audio Level relates to the preferred audio standard for the user. A choice of SMPTE or EBU is given.
Note: Audio is not supplied with the IP streamed multi view. Only local SDI and HDMI outputs provide the
audio.