True enough. I don't remember version 2011 and if it's different today, but F#/Gb is a tritone from your key center so it's an even coin toss which one the program will choose to use in the key of C.

What's the chord progression with this Gb chord? That will often determine which it should be. The other determinant in writing music, not always followed but when in doubt, is that if the notes are ascending use sharps, and are falling use flats.


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