in 
It is unclear whether poco a poco cresc. given in the main text twice – after FE (→GE,EE) – is supposed to be understood as two waves of a dynamic build-up or only one. The repetition of the indication may have just resulted from the fact that in FE a new page begins in bar 21 (cf. the remark concerning bars 19-21). However, the dynamic markings of Ap – particularly the repeated 
in bar 21 – advocate for two waves.
In this place, as an alternative to the indications of the printed version, we give only these indications of Ap, which are totally incompatible with them. The remaining ones are discussed in the remarks concerning bars 19-23, 20-22 and 21.
See b. 19
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category imprint: Differences between sources
issues: Authentic corrections of FE
notation: Verbal indications