# Fix a wrong conversion

Box a misread passage, tag what is wrong, then approve an immediate re-scan or send the zones for revision.

> Type: How-to · Status: Beta · Platforms: iPadOS 17+ · Last reviewed: 2026-07-18

## What fixing a conversion does

`Fix a Wrong Conversion` repairs misread passages of a Smart Score in place. You box each wrong passage on the source PDF page, tag what is wrong, and then either **re-scan** the box for an immediate proposed correction you approve or reject, or **send the zones for revision** to be corrected off-device.

Before you start, you need:

- a piece that has already been converted — the row is greyed out otherwise (`Convert this score to a Smart Score first.`);
- the source PDF page **on this device** — the selection box is drawn on the PDF, not on the engraved score;
- a network connection for the re-scan itself.

## Mark the wrong passages

1. Open the converted piece, open `Toolbox` (the wrench), and select `Fix a Wrong Conversion`. It sits with `Convert to Smart Score`; only the applicable one of the pair is active.
2. Turn to the page with the error. The banner `Box each wrong passage.` confirms you are in selection mode.
3. Draw a blue box around the smallest **complete** passage that contains the error — whole measures work best. One finger draws, moves, and resizes the box. Two fingers always zoom and pan the page and never disturb a box, so zoom in as far as you need before drawing.
4. Under `What's wrong here?`, tap every tag that applies to the selected box: `Wrong note`, `Wrong rhythm`, `Missing trill / ornament`, `Missing 8va / 8vb`, `Extra marking`, `Missing marking`, `Wrong clef / key`, `Wrong lyric`, `Missing lyric`, `Other`. Tags combine — a passage can be both a wrong note and an extra marking.
5. Optionally describe the fix in `Describe the correction` — for example "this note should be D, not E". You can type it or tap `Dictate` and speak it.
6. Repeat for other wrong passages. Each box keeps its own tags and note.

## Re-scan for an immediate correction

1. Select a box and tap `Re-scan selected zone`. The button is only active for a box on the page you are currently viewing.
2. Wait while `Re-scanning the boxed region…` runs — usually a few seconds.
3. Review the `Proposed correction`: the `PDF source · crop` on the left against the `Converted result` on the right, with a shared zoom. Zoom in before accepting, and check every staff and voice inside the boxed measures, not only the note that first looked wrong.
4. Tap `Approve & print into score` to splice the correction into the full score and re-engrave it, or `Reject` to discard the proposal. After approving, the app reports how many measures changed; tap `Done` and verify the measures immediately before and after the corrected passage.

If the re-scan answers `The engine could not read anything in this region.`, redraw a cleaner selection — complete measures, no cut-off staves — and try again.

## Send for revision instead

If the re-scan is slow or its proposal is clearly wrong, tap `Send for revisions` (or `Send N zones for revision` when several boxes exist). This submits every box with its tags and notes for correction off-device; the button changes to `Sent for revision`. Your score is not changed immediately — sending is a request, not an instant fix.

`Send for revisions` stays available at every stage, including from the review screen after a re-scan you don't want to approve.

## When the app refuses to apply a correction

> **Limit** A correction is only applied when its placement in the score is unambiguous. If the app answers `Auto-placement not possible`, it has refused to guess rather than risk changing the wrong measures. Box **one measure at a time**.

> **Important** If the screen says `To box a passage here, this device needs the source page.`, the piece's source PDF is not on this device. Re-import the source PDF to draw selections here.

## After correcting

> **Beta** Fixing one region does not validate the rest of the conversion. Repeat the review for other suspect passages, and recheck anything derived from the score — `Analysis`, `Auto-fingering`, and Follow calibration — after the passage changes.

If selection, re-scan, or approval keeps failing, see [Import and conversion troubleshooting](/docs/troubleshooting/import-conversion). For what a Smart Score version is and how to switch back to the PDF, see [Smart Score overview](/docs/smart-score/overview). To convert a piece in the first place, see [Convert a PDF to Smart Score](/docs/smart-score/convert).