Chord construction
Choose a formula, shape a voicing, and hear exactly what each note contributes.
Cmaj7
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Top = thinnest string. × = muted. 0 = open or capo. Vertically aligned notes sound together.
All generated voicings contain every selected pitch class. Fret-span and finger estimates narrow the choices; choose the shape comfortable for your hand.
Major 7 starts with intervals.
A major triad with a seventh one semitone below the octave.
Sus replaces; add keeps. Sus2 replaces the third. Add9 retains it. A 9 chord also contains a seventh.
Inversion follows the bass. The actual lowest pitch decides the inversion, even in an alternate tuning.
9, 11 and 13 are octave extensions of 2, 4 and 6. Guitar voicings can rearrange their register; the formula names retain their harmonic role.
Cdim7 contains B♭♭, not A. They sound alike in equal temperament, but B♭♭ tells you it is a diminished seventh. The lab preserves that distinction.