Double-cross?

[lflp]

Hi there

Can someone explain to me why - se inserted image - the note
#f is preceded with a doublecross instead of using #g?
The doublecross raises the #f two half-notes, which results in #g.
The bar is from Mozart's kv 331 in A major, 1. part.

Greetings
Flemming

[dima_76557]

The doublecross raises the #f two half-notes, which results in #g.

A "doublecross" raises an already "sharped" note (f# is already part of the key) only once, so you get "g", not "g#".

[sucom]

Hi
The 'double cross' is a double sharp sign which raises the F by two half steps.  Even though the F is sharpened as a result of the key signature, the double sharp sign means to raise the F to F double sharp, which is G and not G sharp.  

[lflp]

Thank you both for your answers. I am quite happy that
the played note is "g" and not "#g".
I have experienced with both notes and the "#g" sounds
just terrible, whereas the "g" sounds right.

Greetings
Flemming