A♭-1+♭2

A flat major, omit root, add flat second

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MSK 007 Leapfrog VCF (patch; see in online store)
MSK 009 Coiler VCF (patch; see in online store)

Equivalent chord symbols: Adim, Am♭5, F7-1, E♯7-1, A♭-1+♭9, G♯-1+♭2.

Notes in this chord: B♭♭, C, E♭. Integer notation: {0, 3, 9}.

Keys in which this chord fits with enharmonic spelling: B♭M, A♯M, Gm

Nearby chords (one less note): F-1, A5♭5, A♭-1.

Nearby chords (one more note): F7, A♭+♯1, Am+♯4, Cdim7, E♭6♭5, Adim+2, Adim+4, Adim+♯1, Adim+♯3.

Parallel chords (same structure, different root): C-1+♭2, D-1+♭2, E-1+♭2, F-1+♭2, G-1+♭2, A-1+♭2, B-1+♭2, D♭-1+♭2, E♭-1+♭2, G♭-1+♭2, B♭-1+♭2, C♯-1+♭2, E♯-1+♭2, F♯-1+♭2, G♯-1+♭2, A♯-1+♭2, B♯-1+♭2.

Experimental fretting charts for guitar standard EADGBE tuning (change tuning or instrument):

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