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Trim with the pro edit grammar

How to blade, ripple, roll, slip and slide in the Horoptic timeline: the keys, what to drag, and what stays put.

Updated October 2026

Trimming is manual editing, so it works in a Local project with no account and no connection. Keys below are the defaults; if you chose another preset, find any command under Keyboard shortcuts… in the command palette (⌘K). On Windows, ⌘ is Ctrl and ⌥ is Alt.

Split a clip (blade)

  1. Select a clip and park the playhead inside it.
  2. Press S (Split clip at playhead), or right-click the clip and choose Split at playhead.
  3. To cut every track at the playhead, use ⇧S (Blade all tracks).

Trim or ripple a clip edge

  1. Point at a clip’s left or right edge until the cursor changes, then drag. A plain trim changes only that clip. Hold ⌥ while dragging to turn snapping off.
  2. To ripple, hold ⇧ as you start the drag, or switch on Ripple in the timeline toolbar. Later clips on the same track shift with the edge; other tracks stay put.
  3. For frame-exact trims, select the clip, tab to an edge and nudge it with ← and → (⇧ for ten frames).
  4. To remove a clip and close its gap, select it and use ⇧⌫ (Ripple delete), or choose Ripple delete from its right-click menu.

Roll, slip and slide in the seam

The seam opens one cut into a larger trim view under its track, marked TRIMMING.

  1. Select a clip, move the playhead near the cut, and press T (Open · close the seam). It opens at that clip’s cut nearest the playhead.
  2. Point at the lane strip at the top of the seam. Each zone names itself before you press:
    • ROLL THE CUT, on the cut: moves both points; nothing after shifts.
    • TRIM OUT and TRIM IN, just either side of the cut: move one edge. With Ripple on, they read RIPPLE OUT and RIPPLE IN, and everything after on the track shifts.
    • SLIP THIS CLIP, further into either clip: moves the content; the clip holds its place.
    • SLIDE THIS CLIP, on the SLIDE RAIL along the bottom, away from the cut: moves the clip; its neighbours absorb it.
  3. Drag left or right. The frames either side of the cut update live; the edit lands when you let go, and the seam stays open.

Trim from the keyboard

  • Arm a verb at the cut: Y for slip, N for roll, U for slide, R for ripple. A closed seam opens first.
  • Type a frame count (12 or −12) or seconds and frames (1:12), then press Return. A roll shows two cells, one for each side of the cut.
  • [ and ] step to the previous or next cut on the track, and the seam follows.
  • Escape clears a typed figure, then closes the seam. T closes it too.

⌘Z undoes any trim.

See also: what the Editor can do · editing with no account · what you need to run Horoptic

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