Pitch
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b. 47-49
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composition: Op. 10 No 4, Etude in C♯ minor
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In AI Chopin wrote the 12th semiquaver in bars 47-48 (and in bar 49, marked as repetition of bar 48) as f category imprint: Differences between sources; Corrections & alterations issues: Enharmonic corrections |
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b. 47-48
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composition: Op. 10 No 4, Etude in C♯ minor
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In AI and FE (→EE,GE1→GE2→GE3) there is no category imprint: Interpretations within context; Differences between sources issues: Omissions to cancel alteration , GE revisions , Errors of A |
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b. 47
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composition: Op. 10 No 4, Etude in C♯ minor
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In AI and FE there is no category imprint: Interpretations within context; Differences between sources issues: EE revisions , Accidentals in different octaves , GE revisions |
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b. 47
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composition: Op. 10 No 4, Etude in C♯ minor category imprint: Differences between sources; Editorial revisions issues: GE revisions |
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b. 50
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composition: Op. 10 No 4, Etude in C♯ minor
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Chopin most probably added the semiquavers referring to the beginning of the Etude still in [A]. See also the change at the beginning of bar 51. category imprint: Differences between sources; Corrections & alterations |
1. In 
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before the last semiquaver in these bars. It is most probably a mistake by Chopin, as there is no reason to change the figuration contour so clearly here, in addition, suggesting the C
before the bottom note of the octave, which is a patent inaccuracy. 
