B♭7♭9♯9 8-string bass chord

How to play B♭7♭9♯9 on 8-string bass

The most common way, the first shape above: lay your index finger flat across the four strings from the B to the D at the 3rd fret, your middle finger on the F♯ string at the 4th fret, your ring finger on the E string at the 4th fret, your ring finger on the A string at the 4th fret and your little finger on the G string at the 4th fret. Don’t play the C and F strings.

From the F♯ string 4 3 4 4 3 4 x x (x: not played, 0: open)

What notes are in B♭7♭9♯9?

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