A diminished, add 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: Adim+11, Adim+♭5, C2+6+♯2, B♯2+6+♯2, C2+13+♯2, B♯2+13+♯2.

Notes in this chord: A, C, D, E♭. Integer notation: {0, 2, 3, 9}.

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

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

Nearby chords (one less note): Am4, Adim, C2+♯2, Dsus2♭2.

Nearby chords (one more note): D9♭9, F7+6, Cm9♭7, Am+4+♯4, A♭+♯1+♯4, Adim+2+4, Adim+4+♯1, Adim+4+♯3.

Parallel chords (same structure, different root): Cdim+4, Ddim+4, Edim+4, Fdim+4, Gdim+4, Bdim+4, C♭dim+4, D♭dim+4, E♭dim+4, F♭dim+4, G♭dim+4, A♭dim+4, B♭dim+4, C♯dim+4, D♯dim+4, E♯dim+4, F♯dim+4, G♯dim+4, A♯dim+4, B♯dim+4.

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