Select: 
Category
All
Graphic ambiguousness
Interpretations within context
Differences between sources
Editorial revisions
Corrections & alterations
Source & stylistic information
Pitch
All
Pitch
Rhythm
Slurs
Articulation, Accents, Hairpins
Verbal indications
Pedalling
Fingering
Ornaments
Shorthand & other
Importance
All
Important
Main


Pitch

b. 12

composition: Op. 29, Impromptu in A♭ major

..

We add a cautionary natural next to f2 on the 4th quaver of the bar. The sign was added by someone else in A and put in GE.

category imprint: Differences between sources; Editorial revisions; Corrections & alterations

issues: GE revisions , Foreign hand additions in manuscripts , Cautionary accidentals

b. 13

composition: Op. 29, Impromptu in A♭ major

..

We add a cautionary flat next to d(the 10th quaver). The sign was added in GE1 and deleted in GE2 (→GE3GE4).

category imprint: Differences between sources; Editorial revisions

issues: GE revisions , Cautionary accidentals

b. 14

composition: Op. 29, Impromptu in A♭ major

..

We add a cautionary flat next to d(the 10th quaver). 

category imprint: Editorial revisions

b. 15

composition: Op. 29, Impromptu in A♭ major

..

At the beginning the 3rd quaver in the L.H. in A was an a, which was changed by Chopin into c1.

category imprint: Corrections & alterations

issues: Deletions in A , Accompaniment changes

b. 15

composition: Op. 29, Impromptu in A♭ major

..

Before the 11th quaver there can be seen a deletion in A; the deleted sign was probably an accidental. 

category imprint: Corrections & alterations

issues: Deletions in A , Enharmonic corrections