Sony MVS-8000X System User Manual page 704

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To undo the recall of a register
Immediately after recalling the register, press the [UNDO] button to undo the
operation.
Notes
After recalling the master timeline, you cannot undo the recall.
704
Recalling a Register
E: The selected register is empty for all currently selectable regions.
To apply a temporary attribute (effect dissolve), press the [+/–/EFF DISS]
button.
Notes
It is not possible to apply temporary attributes to the master timeline.
Press the [ENTER] button.
This recalls the specified register.
When the master timeline is recalled, the region selection buttons light
according to the saved region information.