ETC Congo Family v6.4.0 - Manual (Page 108)

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Facepanel - Trackball
NOTE
Congo JR has no integrated mouse or trackball. It is delivered with
an external mouse that is connected via USB.
The trackball has three different modes that are activated with the keys around it.
Key Feedback
Cursor The trackball controls the cursor in the software.
This is mainly used for creating channel layouts.
Parameter Controls Pan and Tilt of the selected Device(s).
Left/Right work as Next/Last (5.0).
Display List Is used to select and scroll Display Lists. See
Display Lists .
NOTE
It is possible to connect any USB mouse or trackball.
See
External Mouse Or Trackball