Datavideo SE-4000 8-Channel 4K Video Switcher - Manual (Page 76)

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First enable the GPI port and then set the GPI mode, which is either level or pulse. The pulse
width can be configured in Width sub-option (1-9).
Once the GPI function is enabled, you can assign it to one of Inputs 1-8 which can later be
used to trigger external devices and the delay can be set to a value between 0 and 99.
5.7 Audio
In the Audio menu, you will be able to start and shut off the embedded audio of SDI and
HDMI videos.
Audio
External audio source can only enter the SE-4000 via the analog XLR input port found on the
rear panel of the main unit. Ideally the user should use the SE-4000 with an audio mixer.
It is recommended to use AD-200 audio mixer designed and manufactured by Datavideo. All
external audio sources can be connected to AD-200 before entering the SE-4000. The
external audio can be embedded into SDI video out.