@corlin
Correct! Now it's a simple transposition to do it in C# minor.

One shortcut I still use from a TA in undergrad is solfege: Le-Do-Re-Fi (in moveable Do).

@corlin
Well since no one else was game to try, the correct answer to a French augmented 6th chord in C# minor is:

A-C#-D#-Fx
(x = double-sharp)

@voltronic

Thanks.
Oh sorry forgot to get back to you on that.
I had to cheat and look up the transposition. I have always been very bad at that.

@corlin
It was just a half-step up from your previous response.

But like I said the shortcut if you're good with solfège is to use that for any functional harmony (outside of jazz which is its own animal).

So all three flavors of augmented 6th chord start with Le-Do, then add Fi for Italian, Me-Fi for German (enarmonically a dom7) Re-Fi for French.

@voltronic

So in my head I went from A♭-C-D-F♯
To A-C#-D#-G, and thought, no that can't be right because it had to be in C sharp minor..
Then I thought this is confusing. I gonna look it up.

@corlin
Those pesky double-sharps will get ya. You just need to remember that and augmented 6th is just a minor 7th respelled in an annoying way. 😀

Honestly, I think double-accidentals shouldn't be used anymore. I get why they're used, they need to die and we should just spell notes more simply.