According to us, it is highly likely that in FE (→GE,EE) the engraver omitted the letter 'z' in the dynamic marking. It is supported by the following arguments:
-
Chopin wrote
in AI, -
is indicated just before, at the beginning of the piece, -
in the Etudes many marks were omitted in FE (e.g., in the Etude in G
major, No. 5, bar 32, F minor, No. 9, bar 4) or replaced with (e.g., in bar 16 and 26, as well as in the Etude in A minor, No. 2, bar 12, E minor, No. 6, bars 21 and 32, C minor, No. 12, bar 37), -
there is no reason to question the authenticity of
, as immediately afterwards, the crescendo leading to in bar 4 starts, -
the combination is very rare in Chopin's pieces, contrary to , which we can often see in the autographs, as, e.g., in the Etude in E major, No. 11, bars 17-25.
The presence of in FE (→GE,EE) is the first signal of clarifying the notation of dynamic indications in the course of maturing of the Etude, and probably also of a certain change of the concept of first several bars of the piece. The dynamics indicated in the editions is more changeable ( in bar 1 and 8), at less absolute intensity (lack of 
in bars 7 and 12), as a result of which it contributes to a better plasticity both locally and in the Etude as a whole.
category imprint: Differences between sources
issues: Inaccuracies in FE, fz – f
notation: Verbal indications
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