Grass Valley 1200 Operation Manual - Manual (Page 79)

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Transition
Bkgd, Key 1, Key 2
The [BKGD], [KEY 1], and [KEY 2] pushbuttons delegate the
transition controls to the effects keyers and/or the PGM/PST
background mixer. You can select one button or push multiple
buttons simultaneously. The selected buttons light and the others
turn off automatically. The next transition affects only the lit
functions.
Bkgd
The [BKGD] button selects the background transition mode and
delegates the transition controls to the PGM/PST background
mixer. The next transition places PST bus video on air and takes
the current PGM bus video off air. Selections on the two buses
flip-flop at the end of the transition.
Key 1 and Key 2
The [KEY 1] and [KEY 2] buttons select the key transition mode and
delegate the Key bus, Keyer, Matte, and Transition controls to
Keyer 1 or Keyer 2, respectively. When you select one of these
buttons, the next effects transition takes the selected key on or off
air at the Program output. If you select both buttons, the Key bus
and Keyer delegate to Keyer 1, but both keys are affected by the
next transition.
■ The KEY ON legend lights when the keyer is on air.
■ The OVER legend lights to indicate which key layer is on top
of the other.
■ If you double-press [KEY 1] or [KEY 2], the Keyer menu appears,
allowing you to make adjustments to the key.