"Correction" menu

As any other system based on computer recognition, PDFtoMusic is not infallible, and can make some mistakes, more or less important depending on the quality of the document. You can interevene on the recognition result and apply amendments. These changes can be saved so that they are preserved when loading the document again.
PDFtoMusic offers two ways of saving these amendments.

Instrument

For each staff found in the document, PDFtoMusic shows the related instrument. You can change this instrument as well as its volume, panning position, octave shift and semitone shift.
If the instrument is human voice, you can specify the language that Virtual Singer will use for singing the lyrics.

A check box activates globally the "surround" effect. This effect increases the panning separation of the miscellaneous instruments, for all the documents.

Staves and systems

PDFtoMusic includes specific algorithms that "follow" staff lines from a system to another. Indeed, in some scores, some staves can be omitted in systems. This amendment mode enables you to change the way staff lines are connected together.
A description is provided here.

Fonts

A PDF document includes graphic objects (frames, lines, etc) as well as characters extracted from a font. Those characters can be either letters and digits, or music symbols.

PDFtoMusic has some manual font recognition settings that can help correct mistakes, which are described here.

Allow multi-voices staves

If PDFtoMusic considers that one or several staves in the document are made of several voices and you are sure of the opposite, you can deactivate this processing mode.

Allow enhanced chords

Two notes horizontally very close to each other can be considered as belonging to the same chord (there are sometimes chords in which the notes are not perfectly aligned). This option enables you to deactivate this mode.

Allow tuplets

In some scores, a digit appears near the note to indicate the fingering. In some cases, PDFtoMusic interprets this fingering text as tuplets (triplets, etc). If there are no tuplets in the piece, deactivate this option to prevent PDFtoMusic from searching for tuplets in the score.

If you deactive this option, PDFtoMusic will no longer search for tuplets in the score.

Allow fingering

If PDFtoMusic recognizes tuplets as fingering notation (this generally provides a bar duration error), you can deactivate fingering seeking for the whole document.

Allow key changes

It can be sometimes difficult to tell accurately whether the accidentals at the start of a bar are a key change, or regular accidentals that has to be applied to the following notes.
For instance:

If PDFtoMusic finds key changes on a document that doesn't include any, deactivate this processing mode.

Allow shared lyrics

In some vocal pieces (for instance, Barbershop scores), when several performers sing the same lyrics, only one lyric line is written:

When this mode is active, PDFtoMusic will assign the lyric line to both staves.

Allow clefs vertical shift

Is this mode is disabled, clefs vertical position will be ignored

Allow bracket to create groups

Normally, staves groups are notated with braces. Is this mode is active, bracket also create groups.

High resolution

When a document is made of many tiny staves, some inaccuracy errors can occur in the vertical positioning of notes and rests.
Switching to high resolution increases the precision (and the computation time). You can define that all documents will be loaded in high resolution from the general preferences.