To play the F#aug7 chord, place the middle finger on the 3rd fret of the top g-string, ring finger on the 4th fret of the C-string, index finger on the 2nd fret of the E-string, and little finger on the 5th fret of the bottom A-string.
The F#aug7 chord, also known as the Gbaug7 chord, contains the notes F#-A#-C##-E.
To build an F#aug7 chord, take the augmented seventh chord formula (1-3-#5-b7) and apply it to the F# major scale (F#, G#, A#, B, C#, D#, E#).
Identify the first, third, sharp fifth, and flat seventh scale degrees in the F# major scale which are F#-A#-C##-E.
Notice the "C##" which is known as a "C double sharp" is the enharmonic equivalent of a D note.
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