NewTek TriCaster Mini User Manual page 415

For this reason, if you should happen to push the IN button before enabling recording,
it is enabled automatically (illuminating the interface Record button just as if you had
pressed it on the screen).
With Record active, an In Point is set for the current clip that will eventually be stored
(when you press OUT) in the currently delegated DDR (see Section 22.6.3).
Hint: Actually, the IN button can also be thought of as a 'reset In Point' function. Pressing
it updates the In Point, discarding any incomplete clip (i.e., one for which an Out Point had
not been set. The partially recorded data up to that time is simply dropped (and is not
added to the DDR playlist).
ALT + IN
A different operation results when you hold down ALT (see Section
22.6.7) at the same time as you push IN. This operation updates the
In Point of the active clip in the currently delegated DDR to the frame
currently displayed.
FIGURE 367
TW-42 N
Hint: This represents a non-destructive edit of the playlist clip, equivalent to dragging the
trim handle at the left-hand end of the DDR scrub bar.
Pushing the OUT button likewise performs a short series of several actions:

An Out point is assigned to the primary clip

If the Add to switch is enabled in the Record Configuration panel, the clips is
added to any targets configured in the associated destination menu (new
clips are added to the end of the playlist)
Note: This is a non-destructive operation. Rather than actually chopping the file, recording
continues without interruption, and an instance of the file is added to target playlists.
This feature is supported on TW-42 as well.
OTES
(M
ARK
) OUT
Page | 399