Sony DVS-7300 User Manual page 170

Keys
Masking
You can use one mask on each of DSK 1 to DSK 4.
Masking requires the BKDS-7320.
Option
To use the mask function, select item 4 (MASK) in the DSK menu.
The MASK menu appears.
The significance of items and the operational procedure are the same as in the
MAIN MASK menu for the M/E banks. For subsequent operations, see the
section "Using the main mask" (page 4-61).
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Chapter 4 Basic Operations for Image Creation
MASK TYPE
MASK SOURCE
KEY BKGD
OFF MASK MASK BOX
4H
F1 F2 F3 F4
Function key indications in the MASK menu
MASK MASK
PATTERN MODIFY INVERT
OFF
F5 F6 F7 F8 F9 F10