A7♭9 7-string bass chord

How to play A7♭9 on 7-string bass

The most common way, the first shape above: your ring finger on the D string at the 7th fret, your middle finger on the G string at the 6th fret, your little finger on the C string at the 7th fret and your index finger on the F string at the 5th fret. Let the A string ring open. Don’t play the B and E strings.

From the B string x x 0 7 6 7 5 (x: not played, 0: open)

What notes are in A7♭9?

A7♭9, A dominant seventh flat nine, is A, C♯, E, G and B♭: the root (A), the major third (C♯), the perfect fifth (E), the minor seventh (G) and the flat ninth (B♭). Its formula is 1 3 5 ♭7 ♭9.