A2+♯1+♯2+♭1

A major second, add sharp root, add sharp second, add flat root

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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: A2+♯1+♯2+♯7, A♭3+2+♯1+♯2, A♭3+2+♯1+♯9, A♭3+2+♯1+♭3, B♭2+7+♯1+♯7, B♭2+7+♯1+♭1.

Notes in this chord: A♭, A, A♯, B, B♯. Integer notation: {0, 8, 9, 10, 11}.

Nearby chords (one less note): A2+♯1+♯2, A♭3+2+♯1, B♭2+7+♯1, A♭2+♯1+♯2, A♭3+♯1+♯2.

Nearby chords (one more note): E+4+♯4+♯5, F+4+♯2+♯4, A♭+2+♯1+♯2, G4+2+♯1+♯2, A♭4+2+♯1+♯2, G♭dim+2+4+♯3, A♭dim+2+♯1+♯3.

Parallel chords (same structure, different root): C2+♯1+♯2+♭1, D2+♯1+♯2+♭1, E2+♯1+♯2+♭1, F2+♯1+♯2+♭1, G2+♯1+♯2+♭1, B2+♯1+♯2+♭1, D♭2+♯1+♯2+♭1, E♭2+♯1+♯2+♭1, G♭2+♯1+♯2+♭1, A♭2+♯1+♯2+♭1, B♭2+♯1+♯2+♭1.

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

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