Sony MKS-2010 - Manual (Page 171)

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Other Settings
a) Knob 3 appears only when SWR GPI ? Test Fire is selected.
6
Press [Set].
To clear a utility command assignment
Select a button by performing step 4, and press [Clear].
Knob Description Setting values
3 (Command) Utility command
selection 1 and upwards
4 (GPI No) a) GPI number
selection 1 to 16