NewTek TriCaster Mini User Manual page 392

To do this, press the M/E button at bottom right in this section. While this button is
lit, the BKGD and DSK1 delegate buttons, along with other controls in the
TRANSITION group that correspond to existing M/E and M/E KEY layers and effects
are diverted to the currently delegated M/Es.
Note that when you hold down SHIFT while pressing this button, an FTB (Fade to
Black) operation is performed instead. (FTB has no dedicated transition controls;
its fade in/out duration is derived from the BKGD transition setting.)
Hint: When FTB is displayed on Program Out, it obscures all other Switcher activity.
The control surface does not have Transition Bins for the different video layers as
such, but can nevertheless control the transition selection and attributes for
delegated video layers.
S
ELECT
When a single layer, such as BKGD, is selected in the TRANSITION DELEGATE group
on the control surface, rotating the SELECT knob cycles the current transitions in the
Transition Bin for that layer.
When multiple video layers have been delegated, turning SELECT affects the
transitions for all layers as follows:

When all delegated layers are currently on the same transition bin 'slot', the
selection in the corresponding transition bins simply cycles left or right
synchronously.

Otherwise (when the Transition Bin slots for multi-delegated layers are not
aligned vertically), rotating the knob moves the selection layer by layer as the
knob turns until the selected slots are aligned. From that point, continuing to
twist SELECT moves the transition selection in lock step.
The SELECT knob also acts as a push button:

Push SELECT to toggle the Reverse setting for the BKGD transition.

Push SHIFT + SELECT to toggle the Ping Pong switch for the BKGD transition.
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RANSITION IN ONTROL