C2+♯1+♯2+♭7

C dominant second, add sharp root, add sharp second, add flat seventh

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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+♯4, Adim+4+♯3, Adim+11+♯3.

Notes in this chord: C, C♯, D, D♯, B♭♭. Integer notation: {0, 1, 2, 3, 9}.

Nearby chords (one less note): A4+♯2, A4+♯4, Adim+4, Adim+♯3, C2+♯1+♯2.

Nearby chords (one more note): A11♯9♭5, D9♭9+♯7, F7+6+♯5, A+4+♯2+♯4, A♭+4+♯1+♯4, Adim+2+4+♯3, Adim+4+♯1+♯3.

Parallel chords (same structure, different root): D2+♯1+♯2+♭7, E2+♯1+♯2+♭7, F2+♯1+♯2+♭7, G2+♯1+♯2+♭7, A2+♯1+♯2+♭7, B2+♯1+♯2+♭7, D♭2+♯1+♯2+♭7, E♭2+♯1+♯2+♭7, G♭2+♯1+♯2+♭7, A♭2+♯1+♯2+♭7, B♭2+♯1+♯2+♭7.

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

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