About the Adim Baritone chord
Play Adim on Baritone ukulele with the 1 2 1 x shape in DGBE tuning.
Place your index finger on the 1st fret of the D string, your middle finger on the 1st fret of the B string, and your ring finger on the 2nd fret of the G string. Mute the E string. Strum the other three strings and check that each one rings cleanly.
Read the frets across D, G, B and E. A 0 means open and x means mute. These fingerings are for Baritone strings. A Standard gCEA chart uses different shapes for the same chord names.
Root
A
Quality
Diminished
Notes
A · C · Eb
How the Adim chord works
A
Root (1)
The home note. It gives the chord its name.
C
Minor third (♭3)
The defining minor interval above the root.
Eb
Diminished fifth (♭5)
A lowered fifth that adds harmonic tension.