It sounds sharp-edged. The 9th sits a whole step below the minor 3rd; m9 adds the flat 7th between them and spreads those notes across a larger voicing.
5 moveable shapes. None has an open string in it, so each one plays every root there is; the dots are degrees, and R is the root.
Pick a root and every diagram below moves to it. Nothing about any of the shapes changes — only the fret they start on, and each one starts somewhere different because they are rooted on different strings.
Showing Cmadd9. Every voicing of it, open strings included, is on its own chord page.
The lowest root available, so these are the fullest-sounding shapes and the ones that carry a band. F at the first fret, G at the third, A at the fifth: the shape is the same and the fret is the whole of the difference.
8657xx
4 notes · 4 frets
The other half of the pair. Pair them with the low E shapes and the hand barely moves: the root a fourth up sits at the same fret on the A string, and the root a fifth up two frets higher.
x-15-13-12-15-x
4 notes · 4 frets
No bass note under it, which is the point rather than a shortcoming: these sit above a bass player instead of competing with one, and they reach the extensions the lower shapes have no fingers left for.
x-x-10-8-8-10
4 notes · 3 frets
The same chord with something other than the root underneath. You reach for one of these because of what the bass is doing, not because of what the chord is — a bass line that walks while the harmony stays put is made of these.
♭3 in the bass. 2 ways to get it.
♭3 on the A string, root on the G string
x6553x
4 notes · 4 frets
♭3 on the D string, root on the B string
x-x-13-12-13-10
4 notes · 4 frets
Every voicing of one particular madd9 chord — including the open-string ones that do not move — is on that chord's own page, linked under each shape above. All the moveable shapes for every quality are on the shapes index, and the minor chords as a family are on their own page.
Shows each chord the way this style would voice it, and marks which of its alternatives belong to the idiom.