Sony DVS-9000 User Manual page 477

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Macro Operations in the Standard Type Flexi Pad Control Block
Select the bank of the register holding the macro you want to delete.
For details of the method of operation, see step 2 (page 471) of "Recalling
a Macro Register and Executing a Macro."
Hold down the [STORE STATS] button, and then press the button in the
memory recall section showing the corresponding register number.
The button you pressed in the memory recall section goes off, and this
deletes the macro. The [STORE STATS] button lights amber.