A major fourth, add second

music notation
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Choose audio sample set:
MSK 007 Leapfrog VCF (patch; see in online store)
MSK 009 Coiler VCF (patch; see in online store)

Equivalent chord symbols: A4+9, A3+2+♯3, B2+7+♯2, B2+♯2+♯6, C♭2+7+♯2, C♭2+♯2+♯6.

Notes in this chord: A, B, C♯, D. Integer notation: {1, 2, 9, 11}.

Keys in which this chord fits with this spelling: DM, AM, Bm, F♯m

Keys in which this chord fits with enharmonic spelling: C♭m, G♭m

Nearby chords (one less note): A4, A3+2, D6-3, B2+♯2.

Nearby chords (one more note): Bm9, A+2+4, Bm9♭5, G+2+♯4, A4+2+♯1, A4+2+♯2, A4+2+♯4, A♭dim+4+♯1.

Parallel chords (same structure, different root): C4+2, D4+2, E4+2, F4+2, G4+2, B4+2, C♭4+2, D♭4+2, E♭4+2, F♭4+2, G♭4+2, A♭4+2, B♭4+2, C♯4+2, D♯4+2, E♯4+2, F♯4+2, G♯4+2, A♯4+2, B♯4+2.

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