A minor fourth

music notation
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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: C2+6, B♯2+6, C2+13, C2+♭7, Adim♭5, B♯2+13.

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

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

Keys in which this chord fits with enharmonic spelling: E♯M, A♯M, B♯M, F♭m

Nearby chords (one less note): C2, D5, F-1.

Nearby chords (one more note): D7, F6, Am+4, A4+♯2, Am4+2, Adim+4, C2+6+7, A♭♭5+♯1, Gsus4+2.

Parallel chords (same structure, different root): Cm4, Dm4, Em4, Fm4, Gm4, Bm4, C♭m4, D♭m4, E♭m4, F♭m4, G♭m4, A♭m4, B♭m4, C♯m4, D♯m4, E♯m4, F♯m4, G♯m4, A♯m4, B♯m4.

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