A4+♭3

A major fourth, add flat third

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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: A4+♯2, A4+♯9, C2+6+♯1, B♯2+6+♯1, C2+13+♯1, B♯2+13+♯1.

Notes in this chord: A, C, C♯, D. Integer notation: {0, 1, 2, 9}.

Nearby chords (one less note): A4, Am4, A3+♯2, C2+♯1.

Nearby chords (one more note): D7+♯7, F6+♯5, A+4+♯2, A4+2+♯2, A4+7+♯2, A4+♯1+♯2, A♭♭5+4+♯1, Adim+4+♯3.

Parallel chords (same structure, different root): C4+♭3, D4+♭3, E4+♭3, F4+♭3, G4+♭3, B4+♭3, C♭4+♭3, D♭4+♭3, E♭4+♭3, F♭4+♭3, G♭4+♭3, A♭4+♭3, B♭4+♭3, C♯4+♭3, D♯4+♭3, E♯4+♭3, F♯4+♭3, G♯4+♭3, A♯4+♭3, B♯4+♭3.

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

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