Banjo A♭7 chord (Open D)A♭ seventh on the 5-string banjo: 1 2 3 4, and 6 more shapes

Frets, string 4 to string 1: 1 2 3 4 (first position)

1. String 4 (D): 1st fret, index finger, E♭
2. String 3 (F♯): 2nd fret, middle finger, A♭
3. String 2 (A): 3rd fret, ring finger, C
4. String 1 (D): 4th fret, little finger, G♭
5. String 5, the short f♯: open, G♭, in the chord

Sounds: E♭ A♭ C G♭  ·  A♭7 is A♭, C, E♭, G♭ (1 · 3 · 5 · ♭7)

The 5th string: the short g♭ is the ♭7 of A♭7, so let it ring.

With a capo: on the 1st fret it’s 0 1 2 3 (frets counted from the capo), an open G7 shape. Spike the 5th string at the 6th fret to keep it in tune with the capo.

Open D tuning: f♯DF♯AD, the short 5th string first, then strings 4 to 1.