All chords

D F Ab B: D diminished seventh chord

Keyriff names these keys Ddim7. It also reads them as Fdim7/D, G#dim7/D and Bdim7/D. In D diminished seventh they’re spelled D F Ab Cb.

• Root position of Ddim7
• Third inversion of Fdim7
• Second inversion of G#dim7
• First inversion of Bdim7