Lacoura Video

Editing

The trim tools, what each one actually does to the clips around it, and the edits that do not need a tool at all.

Three-point editing

Mark I and O in the Source monitor, put the playhead where you want the clip to land, then:

Key	Edit	What happens to the rest
.	Overwrite	Whatever was under it is replaced. Nothing moves.
,	Insert	Later clips are pushed right by the clip’s length.

Insert ripples every unlocked track, which keeps sync by default. Per-track sync locks arrive with the next phase.

The tools

Key	Tool	What it does
V	Selection	Move clips; drag an edge to trim it, leaving a gap or overwriting.
A	Track Select Forward	Selects this clip and everything after it. Shift extends to every track.
Shift+A	Track Select Backward	The same, backwards.
B	Ripple Trim	Trims an edge and closes or opens the timeline behind it.
N	Rolling Edit	Moves the cut between two clips. Total length is unchanged.
Y	Slip	Changes which part of the source is used. Position and length unchanged.
U	Slide	Moves a clip between its neighbours, retrimming them. Needs a clip on both sides.
R	Rate Stretch	Drag an edge to change the clip’s speed, keeping its source range.
C	Razor	Click a clip to split it at that point.

Edits that need no tool

Key	Action
Cmd/Ctrl + K	Split the selection, or whatever is under the playhead
Q	Ripple trim the head back to the playhead
W	Ripple trim the tail forward to the playhead
Delete	Lift — remove the clip and leave a gap
Shift + Delete	Ripple delete — remove it and close the gap
Alt + ← / →	Nudge the selection one frame (add Shift for five)
Shift + E	Enable or disable a clip without removing it
M	Add a marker at the playhead

Snapping

Snap in the timeline toolbar pulls clip drags to edit points, markers and the playhead. Turn it off when you need a position that is deliberately just off a cut.

Scrubbing

Dragging the playhead plays audio as you go. Scrub audio is decoded separately from playback, so it stays available even when a clip is still loading — if you can hear a scrub but not a play, that difference is a real signal and worth reporting.