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Other Features
Outputting a Tally Signal
You can output a tally signal from the TALLY/GPIO connector.
A tally signal is output from the connector pin corresponding to
the video channel being output, also including video composition
and transition effects.
* The tally signal output affects the video of the PGM/1 and
PVW/2 buses.
Roland website
For the specifications of the TALLY/GPIO connector, refer
to the Reference Manual (PDF), available for download at
the Roland website.
https://proav.roland.com/