NewTek TriCaster 8000 - Manual (Page 399)

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 Similarly, the M/E KEY button assigns the Joystick to control position
attributes for the KEY layer of currently delegated M/Es.
 Again, selecting VIRTUAL ZOOM tells the Joystick to control the zoom level of
the currently delegated M/Es. The joystick mode buttons (such as
POS/SCALE, discussed shortly) are not lit when the POSITIONER DELEGATE
selection is VIRTUAL ZOOM.
Use the joystick to control Virtual Zoom as follows:
o To zoom in:
 Push the joystick forward (as viewed from above), or twist
the joystick clockwise.
o To zoom out:
 Pull the joystick back (as viewed from above, or twist the
joystick counter-clockwise.
 Push SHUTTLE to delegate the joystick to shuttle the Media Player(s)
currently selected in the MEDIA PLAYERS DELEGATE group. Use CTRL with
the joystick for slower and more accurate shuttle speed. Joystick mode
buttons are not lit when SHUTTLE is delegated.
Use the joystick to control Virtual Zoom as follows:
o To shuttle delegated Media Players, move the joystick horizontally (as
viewed from above).
The DSK 1 and DSK 2 delegate buttons provide direct selection for these video
layers, and are not modified by selections elsewhere.
Note: Two of the delegates (VIRTUAL ZOOM and SHUTTLE) are set apart from their
siblings. This is because neither of these options supports multi-selection (with other
Positioner delegates) like the rest. (Nevertheless, you can zoom multiple M/Es
simultaneously when these are selected in the M/E DELEGATE group, or shuttle several
delegated Media Players.)