Keep both sides. Rewrite only the middle window.
Use Replace Section when the start and ending are good, but one middle span needs new audio or lyrics. Do not use it to continue the song past its current ending.
Replace Section rewrites a middle window and leaves both sides.
Replace Section is a Pro action. Open a completed track, choose Replace Section from the song menu, and Pro accounts can drag the two handles. Free accounts see the upgrade modal. The span must be 10–60 seconds and no more than half the song. Type the new lyrics for that window, then click Generate.
KEEP + KEEP — start and ending stay
Audio before the first handle and after the second handle stays.
REPLACE — only the middle window
Only the highlighted middle span is rewritten.
What the Replace waveform means
Two handles, not one cut. The job is a hole in the middle, not a new ending.
Replace a section in five moves
The primary control is the waveform region. Lyric lines are helpers when timestamps exist.
- 1
Open ⋯ and choose Replace Section
This is a Pro action. Without a subscription, RaoMusic opens the upgrade modal instead of the editor.
- 2
Drag the two handles to set the window
Default starts near one-third of the song. The span must be 10–60 seconds and no more than half the duration. You can also type the start and end times.
- 3
Write the new lyrics for that window
If your song already has timed lyrics, only the lines inside the window are editable. If it does not, type the new words for that part — missing timestamps do not block you.
- 4
Click Generate
The region must be valid and the section lyrics cannot be empty. Generate starts a new task. It uses the same credits as generating a new song on the selected model.
- 5
Listen from before the window
RaoMusic returns two candidate songs and the original stays in your list. Start playback a few seconds before the window and check that the beat, key, and vocal tone carry straight through it. Keep the candidate where the window sounds like it was always there.
Choose the right window
Replace Section is strongest on small, well-defined targets. 10–60 seconds is the hard limit — the sweet spot is narrower.
Aim for
- A 10–30 second window — long enough to rebuild a full phrase, short enough that the melody around it survives.
- One complete section: a verse line, half a chorus, a short bridge.
- The weakest link only. If the hook works, protect it.
- One intent per run — fix the words or change the feel, not both at once.
Watch out
- Windows near 60 seconds tend to drag the surrounding melody along with them.
- A window of a word or two can swell into a much longer new block.
- A section the song repeats elsewhere — the twin section will not change with it.
- Stacking many replacements in a row. Extra passes can make the track feel less consistent.
What to type for the window
Only the window is rebuilt, so only the window needs words. Both sides of the song are already fixed audio.
Do
- Type the new lyrics for exactly the lines inside the window.
- Add the section tag for the window, like [Verse 2] or [Chorus].
- Match the syllable count of the original line when you are only rewording it.
- For a feel change instead of new words, describe the direction in place — for example [Bridge — stripped back, close vocals].
Avoid
- Leaving the section lyrics empty — Generate will not start without them.
- Rewriting lines outside the window. They are already fixed audio and will not be recorded.
- Changing genre or voice for the whole song — the window will stop matching its neighbors.
Easy to get wrong
The main control is the waveform window, not tapping lyric lines. Timed lyrics only lock which lines you can edit.
No timestamps is not a hard stop. Fill the lyrics box with the new section text and continue.
A span under 10 seconds, over 60 seconds, or longer than half the song will stay invalid until you resize it.
Do not use Replace to continue a song past its current ending. That job is Extend.
If the melody around the window changed too, the window was probably too wide. Shrink it toward the 10–30 second sweet spot and run again.
If the new block came out longer than the window, the window was too small to hold a phrase. Widen it to cover a complete line.
Multiple replacement passes can make the track feel less consistent. Fix the weakest section first and stop when the song holds up.
Replace vs Extend
Use Replace to patch a middle problem. Use Extend when you are done with the opening and want a new rest of the song.
| Question | Replace Section | Extend |
|---|---|---|
| What stays | Start and ending | Only the start |
| Selection | Two handles, 10–60s, ≤ half the song | One cut point |
| Lyrics | Required for the window | Optional |
| Access | Pro | No Pro badge |
| The take itself is broken | Editing saves nothing worth keeping | Generate a new song instead |
What stays
- Replace Section:Start and ending
- Extend:Only the start
Selection
- Replace Section:Two handles, 10–60s, ≤ half the song
- Extend:One cut point
Lyrics
- Replace Section:Required for the window
- Extend:Optional
Access
- Replace Section:Pro
- Extend:No Pro badge
The take itself is broken
- Replace Section:Editing saves nothing worth keeping
- Extend:Generate a new song instead
Replace Section FAQ
Yes, in the product. The menu shows a Pro badge, and opening it without a subscription shows the upgrade modal.
Between 10 and 60 seconds, and no more than half the song. The handles will not let the box grow past that.
No. Timestamps make the in-region lyric editor more precise. Without them, type the new section lyrics in the box.
The window is too short, too long, or larger than half the song — or the replacement lyrics are empty.
Yes. Uploads and generated songs both work. Exports like stems and WAV still stay on generated tracks.
Extend throws away everything after one cut. Replace keeps both sides and only rewrites the middle span.
No. Generate starts a new task. The original completed song stays in your list, so you can go back to it if the new section is worse.
Aim for 10–30 seconds inside the 10–60 second limit — long enough to rebuild a complete phrase, short enough that the melody on both sides survives.
Usually the window is too wide, or the instructions reached past the window. Shrink the window toward the sweet spot, keep the section tag only, and let both sides stay fixed.
Yes — one section per run, always from the newest version of the song. Extra passes can make the track feel less consistent, so fix the weakest section first and stop while the song still holds up.
Related guides
Keep both sides. Rewrite the middle.
Open a completed song on Create, choose Replace Section, and set a 10–60 second window around the part that is wrong.