C dominant second, add sixth, add 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: Am4+♯1, B♯2+6+7, C2+6+♯6, C2+7+13, B♯2+7+13, Adim♭5+♯1.

Notes in this chord: C, D, A, B♭. Integer notation: {0, 2, 9, 10}.

Keys in which this chord fits with this spelling: FM, B♭M, Dm, Gm

Keys in which this chord fits with enharmonic spelling: E♯M, A♯M

Nearby chords (one less note): Am4, B♭3+2, D5+♯5, B♭2+♯7.

Nearby chords (one more note): B♭M9, D7+♯5, B♭M9♭5, Gm+2+4, A4+♯1+♯2, Am4+2+♯1, A♭♭5+2+♯1, Adim+4+♯1.

Parallel chords (same structure, different root): D2+6+7, E2+6+7, F2+6+7, G2+6+7, A2+6+7, B2+6+7, C♭2+6+7, D♭2+6+7, E♭2+6+7, F♭2+6+7, G♭2+6+7, A♭2+6+7, B♭2+6+7, C♯2+6+7, D♯2+6+7, E♯2+6+7, F♯2+6+7, G♯2+6+7, A♯2+6+7, B♯2+6+7.

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