Datavideo RMC-90 User Manual download pdf (Page 8)

Video Main-source and SUB-source Select for channel A, B, C or D and BK

(Background) function key

It is used to select which of the four video input channels or background will be

selected as Main Source and which of the four video input channels or

background will be transitioned to or used as a sub source in an effect.

For more information, please refer to the Front Panel section of SE-800

instruction manual.

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Datavideo RMC-90 User Manual Page 8