To play the Gbdim7 chord, place the index finger on the 2nd fret of the top g-string, ring finger on the 3rd fret of the C-string, middle finger on the 2nd fret of the E-string, and little finger on the 3rd fret of the bottom A-string.
The F#dim7 chord, also known as the Gbdim7 chord, contains the notes F#-A-C-Eb.
To build an F#dim7 chord, take the fully diminished seventh chord formula (1-b3-b5-bb7) and apply it to the F# major scale (F#, G#, A#, B, C#, D#, E#). The "bb7" indicates a double flat seventh, meaning you lower the seventh scale degree two half steps.
Identify the first, flat third, flat fifth, and double flat seventh scale degrees in the F# major scale which are F#-A-C-Eb.
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