Grass Valley Maestro Master Control v.2.4.0 - Manual (Page 249)

245 MAESTRO User Manual
Section 2 — Basic Maestro Operation
Downstream Keyer Operation
The downstream keyers can be used to insert Persistent keys that will
remain on the Program bus regardless of action taken with the background
video and the upstream keyers.
When Downstream is ON (and Upstream is OFF), the next transition will ONLY
affect the downstream keyers. It will not affect the background signal on
Program or the background signal on Preset. This mode is indicated by a
red button on the program bus and a purple button on the Preset bus.
Assigning a Source to a Key
In the Keyer Control Panel, use the Shift button to access keyers five through
eight. Keys signal are assigned as described above.
Select the key on the Preset bus and adjust as necessary.
Inserting the Key
To place the key on the Program bus, you must perform a transition.
At this point, the downstream keyers are operated exactly as described
above for the upstream keyers. The difference is that the background is not
changed during transitions.
Leaving a Downstream Key on Program and Returning to Upstream
Mode
Downstream = OFF. Upstream = ON. The status of the downstream key is
shown by the red tally indicating it is on Program. Transitions will now
apply to the Preset and Program buses in the usual way, but the down-
stream key will remain on Program.
The upstream keyers can also be used as before, again, without affecting
the downstream key.
To remove the downstream key, return to the Downstream mode and then
perform a transition.
Operating Up- and Downstream Keyers with a Single Transition
If the Upstream and Downstream buttons are both lit, the next transition will
apply to both upstream and downstream keyers, and will also affect the
background. The
Shift button should be used to check the status of all keys