A minor fourth, add second

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: Am4+9, C2+6+♯7, Adim♭5+2, B♯2+6+♯7, C2+13+♯7, B♯2+13+♯7.

Notes in this chord: A, B, C, D. Integer notation: {0, 2, 9, 11}.

Keys in which this chord fits with this spelling: CM, GM, Em, Am

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

Nearby chords (one less note): Am4, D6-3, A2+♯2, C2+♯7.

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

Parallel chords (same structure, different root): Cm4+2, Dm4+2, Em4+2, Fm4+2, Gm4+2, Bm4+2, C♭m4+2, D♭m4+2, E♭m4+2, F♭m4+2, G♭m4+2, A♭m4+2, B♭m4+2, C♯m4+2, D♯m4+2, E♯m4+2, F♯m4+2, G♯m4+2, A♯m4+2, B♯m4+2.

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