Using The Show Key Function - Sony DVS-9000 System User Manual

Using a frame memory feed
When you press the [FM FEED] button in the key control block, it lights
momentarily amber, then the key fill and key source signals processed in the
currently selected keyer are assigned to frame memory sources 1 and 2.
If a DME is selected on the currently selected keyer, then the key fill and key
source signals to which a DME effect is applied are assigned to frame memory
sources 1 and 2.
Carrying out a frame memory feed causes the [PROC KEY] button to light
amber.

Using the show key function

While the [SHOW KEY] button is held down, the key-processed key source
signal appears on the specified output. (Show key mode)
Even when the [SHOW KEY] button is released, for a preset time the show key
mode is maintained. You can specify the output to which the show key function
is applied and set the time for which the show key mode is maintained after
releasing the button in a Setup menu.
For details see "Settings Relating to Keys, Wipes, Frame Memory and Color
Correction (Key/Wipe/FM/CCR Menu)" in Chapter 20 (Volume 3).
Using the auto delegation function
To couple the selection in the key delegation buttons of the independent key
transition control block so that the key control block delegation selection is
automatically switched, in the key control block press the [AUTO DELEG]
button, turning it on.
Returning the key adjustment values to their defaults
Holding down a key type button ([LUM], [LIN], [CRK], [CVK], or [PTN])
recalls the key default values (page 154).
Key modify clear
When an M/E delegation button is held down, holding down a key delegation
button together returns the key settings to the initial status settings.
For details of the initial status, see "Selecting the State After Powering On
(Start Up Menu)" in Chapter 18 (Volume 3).
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Key Setting Operations With the Key Control Block