A2+♯1+♭1

A major second, add sharp root, 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+♯7, A♭2+♯1+♯2, A♭2+♯1+♯9, A♭2+♯2+♭2, G♯2+♯1+♯2, G♯2+♯1+♯9.

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

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

Nearby chords (one more note): E+4+♯4, A♭m+2+♯1, G♭4+2+♯2, A♭m4+2+♯1, E♯♭5+4+♯2, A♭dim+2+♯1, G3+2+♯1+♯2, A♭3+2+♯1+♯2.

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

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

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