Failure to do this will produce unstable video both in sync and colorburst. This configuration requires additional serial ports to control the VCRs and Switcher and the optional appropriate VCR and Switcher EXes. When using the Vine Genlock in overlay mode, please note that it is not possible to control the transparency from Scala. No overlay, but very clean. The video and audio chain is very easy here.
All sources feed into the switcher.
This includes the outputs from the Vine Scan Converter, each VCR, and the Optibase card. The audio output from the switcher is fed into a Balanced AGC box before connecting to the RF Modulator. No overlays are possible in this configuration but the hookup is very straight forward, even with a large number of video and audio sources. Please note that you will need to control the switcher EX directly when playing MPEG in this configuration. The VCR EXes can however automatically control the switcher EX without creating a special event.