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- Left hand
- F2Ab2Cb3F3
- Family
- Triads
The Doubled Root voicing of Fdim stacks F, Ab, Cb and F from the bottom up: the root, minor 3rd, flat 5th and root of the chord.
It's one of the Triads voicings. The others for Fdim are Root Inversion, 1st Inversion and 2nd Inversion.