A4+♯9

A major fourth, add sharp ninth

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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+♭3, C2+6+♯1, B♯2+6+♯1, C2+13+♯1, B♯2+13+♯1.

Notes in this chord: A, C♯, D, B♯. 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+♯9, D4+♯9, E4+♯9, F4+♯9, G4+♯9, B4+♯9, C♭4+♯9, D♭4+♯9, E♭4+♯9, F♭4+♯9, G♭4+♯9, A♭4+♯9, B♭4+♯9, C♯4+♯9, D♯4+♯9, E♯4+♯9, F♯4+♯9, G♯4+♯9, A♯4+♯9, B♯4+♯9.

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

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