B♭7♭9♯9 7-string bass chord

How to play B♭7♭9♯9 on 7-string bass

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

From the B string x 6 5 6 6 5 6 (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.