A major, add sharp 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: A+♭5, A+♯11, C♯m♯5+2, C♯m♯5+9, D♭m♯5+2, D♭m♯5+9.

Notes in this chord: A, C♯, D♯, E. Integer notation: {1, 3, 4, 9}.

Keys in which this chord fits with this spelling: EM, C♯m

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

Nearby chords (one less note): A, A4♯4, D♭2+♯2, Asus4♯4.

Nearby chords (one more note): A6+♯4, A7+♯4, A+2+♯4, A+4+♯4, A+♯1+♯4, A+♯2+♯4, A+♯4+♯5, A+♯4+♭1.

Parallel chords (same structure, different root): C+♯4, D+♯4, E+♯4, F+♯4, G+♯4, B+♯4, C♭+♯4, D♭+♯4, E♭+♯4, F♭+♯4, G♭+♯4, A♭+♯4, B♭+♯4, C♯+♯4, D♯+♯4, E♯+♯4, F♯+♯4, G♯+♯4, A♯+♯4, B♯+♯4.

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