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b. 27

composition: Op. 25 No 7, Etude in C♯ minor

..

In FE there is no  lowering g2 to g2 on the 1st chord of the bar, which is a patent error. The sign is in all remaining sources. All sources, together with FE, include a  at this pitch before the chord on the 2nd beat of the bar. In the main text, we omit this unnecessary sign in this context.

category imprint: Interpretations within context; Differences between sources

issues: Errors in FE

b. 33

composition: Op. 25 No 7, Etude in C♯ minor

Rest in GC (→GE) & FE

Fourth in EE

..

The Chopin corrections visible in GC allow to state that the additional quaver of the accompaniment in EE is the original version, left in the base text to this edition most probably by inattention.

category imprint: Differences between sources; Corrections & alterations

issues: Authentic corrections in GC

b. 38-39

composition: Op. 25 No 7, Etude in C♯ minor

g1 in GC (→GE) & EE1

g1 in FE & EE2 (→EE3)

..

The version of FE – the E minor chord twice – could have been introduced in the proofreading of FE and was accepted by Chopin during the lessons, which is proved by Chopin entries in FES and FED, performed in the direct neighbourhood of this place. We adopt it to the main text as the undoubtedly authentic and possibly the latest version. Its appearance in EE2 (→EE3) indicates the use of an FE copy while editing this impression (cf. the Etude in G minor, No. 6, bar 4). In this situation, the version of GC (→GE) and EE1 with the E major chord, appearing twice, seems to be either earlier or even erroneous (this kind of oversight of accidentals defining a minor key may be suspected in the Etude in F minor, Dbop. 36 No. 1, bars 41-45).

It is one of these places in which the later editorial and performance practice consolidated the non-authentic compilation of source editions with g1 in bar 38 and g1 in bar 39. 

category imprint: Differences between sources; Corrections & alterations

issues: Accompaniment changes , Authentic corrections of FE

b. 39

composition: Op. 25 No 7, Etude in C♯ minor

..

In GC, FE and EE1 (→EE2) there is no  lowering c1 to c1, whereas in FE there is also no sign before in the L.H. The necessary signs were added in FES, GE and EE3.

category imprint: Interpretations within context; Differences between sources

issues: Annotations in teaching copies , EE revisions , Errors in FE , GE revisions , Omission of current key accidentals , Annotations in FES

b. 44

composition: Op. 25 No 7, Etude in C♯ minor

..

We add a cautionary  before A. The addition was introduced already in GE2 (→GE3).

category imprint: Differences between sources

issues: GE revisions