The Ab Diminished Arpeggio contains the following notes:
Ab – Cb – Ebb
It is essentially an Ab minor chord, with a flat 5.
Here’s how to play the Ab diminished arpeggio in the open position.
A Flat Diminished Arpeggio CAGED Positions
Here are the 5 CAGED positions for the Ab diminished arpeggio on the guitar (notes and tabs).