To play the G#dim7 chord, place the index finger on the 1st fret of the top g-string, ring finger on the 2nd fret of the C-string, middle finger on the 1st fret of the E-string, and little finger on the 2nd fret of the bottom A-string.
The G#dim7 chord, also known as the Abdim7 chord, contains the notes G#-B-D-F.
To build a G#dim7 chord, take the fully diminished seventh chord formula (1-b3-b5-bb7) and apply it to the G# major scale (G#, A#, B#, C#, D#, E#, F##). 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 G# major scale which are G#-B-D-F.
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