Augmented sixths are IV6s that all resolve outward to scale degree 5 (Ab-C-F# -> G-G in C major)
The fourth pitch goes up as you go north (It. C / Fr. D / Ger. Eb in that example)
Neapolitans are different: ii6s that have been twice flatted (F-Ab-Db)
Augmented sixths are IV6s that all resolve outward to scale degree 5 (Ab-C-F# -> G-G in C major)
The fourth pitch goes up as you go north (It. C / Fr. D / Ger. Eb in that example)
Neapolitans are different: ii6s that have been twice flatted (F-Ab-Db)