Hammond Skx PRO Reference Manual page 101

Combinations
81
SPECIAL NOTE:
If the EXTERNAL ZONES Parameter in the SYSTEM - MIDI - GENERAL FUNCTION Mode Page
(described on pages 75, 615 to 77, 617) is set to "Off," the Information Center Display will look
similar to this:
Notice that all the boxes are "greyed out." This indicates that no External Zone MIDI data will be
transmitted even if the SW settings are set to On.
If the EXTERNAL ZONES Parameter is On, the Information Center Display will look similar to this:
The boxes are now showing white. This lets you know that External Zone data will be transmitted
to a connected MIDI Device. Use the SW Parameters to control External Zones 1, 2 and 3 separately.
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SKX PRO Reference Guide