How to Change the Length of a Song Section

Drag the boundary between two sections on the arrangement timeline in Pro mode — it snaps to the beat grid and ticks as you cross each beat. You can still do it in Ableton by moving locators and dropping the updated .als, if the set is where you work.

Want the Chorus to run 10 bars instead of 8, or a Verse to start two bars earlier? That's a length change, not a rename — and you can now do it directly on the Pliris arrangement timeline. You can still do it in Ableton instead, if the Live Set is where you'd rather work.

The quick way: drag the boundary in Pliris

Switch the arrangement page to Pro (next to Simple, above the timeline), then drag the boundary between two sections left or right.

The seam snaps to the beat grid, and you'll hear a tick each time you cross a beat, accented on the downbeat — so you can feel where you're landing without watching the numbers.

Because you're dragging a boundary, it changes two sections at once: one gets longer, the other shorter. That's the same rule as moving a locator in Ableton, just without the round trip.

⌘Z undoes a drag, and every resize is written to Snapshot History, so you can go back to how the song was earlier.

Resizing moves the boundary between two labels, not the audio. Your stems are untouched — a longer Chorus means the Chorus label now covers more of the same recording, not that anything was stretched or re-rendered.

For the rest of what Pro mode can edit — time signatures and tempo — see Editing the Grid. Splitting and merging sections aren't Pro edits at all: right-click a section in Simple mode and choose Split here or Merge with previous / Merge with next — see Adding and Changing Song Sections.

The Ableton way

If the Live Set is your source of truth, the original route still works exactly as before.

Section boundaries are read from the cue markers (Locators) on your Ableton Live arrangement timeline, so that's where the change needs to happen. A section runs from its own start locator to the next section's start locator — there's no separate "end locator" — so which locator you move depends on which boundary you're changing, and moving either one also changes the adjacent section to match:

  • To move where a section starts (e.g. make the Verse start two bars earlier): move that section's own locator — the section before it shrinks or grows to fill the gap. If it's the first section in the song (e.g. the Intro), there's no earlier section to affect instead: moving its locator just moves where that leading section — and the arrangement's first counted section — begins.
  • To move where a section ends, which is how you change its length (e.g. make an 8-bar Chorus run 10 bars): move the locator that starts the section after it — that section shrinks or grows to match. If it's the last section in the song, there's no next section to move instead: move the song-end marker, which changes the overall song/arrangement length rather than any adjacent section.
  1. Open the song in Ableton Live.
  2. Move the relevant boundary locator to the new point, per above.
  3. Save the Live Set.
  4. Open the song's arrangement page in Pliris and drag the updated .als onto it (the Drop .als overlay appears).
  5. Review the summary Pliris shows you — it reads the new locator placement and rebuilds the section from it — then click Update arrangement.

Your stems aren't touched by this — Pliris re-reads the structure around your audio, not the audio itself. Full detail on exactly what a drop picks up: Updating an Arrangement from Ableton and What Gets Imported When You Update from Ableton.

Made a mistake? Every .als drop is captured in Snapshot History, so you can restore the version from before.

Don't confuse this with

Frequently asked questions

Can I drag a section marker to resize it directly in Pliris?

Yes — switch to Pro mode and drag the boundary between two sections. It snaps to the beat grid. This changes the section on each side of that boundary, the same way moving a locator in Ableton does.

The Ableton route still works if you prefer it: move that section's own locator to change where it starts, or the next section's locator (or the song-end marker, for the last section) to change where it ends, then drop the updated .als on the arrangement page.

Will changing a section's length in Ableton affect my stems?

No. Dropping an updated .als re-reads structure, tempo, mix, and clip alignment — it doesn't touch or re-analyze your stem audio.

I don't see the length change after dropping my updated file — what happened?

Check the review summary before you click Update arrangement — if the locator move didn't land the way you expected in Ableton, cancel and fix it in Live before dropping again. You can also compare against a previous version in Snapshot History.

Where to go next

Stuck at any point, click the support bubble in the bottom-right corner of any page, or email support@fromstudiotostage.com.