25.11Level 4 — bass line into iiø–V–i

Take:

C → B → B♭ → A

then:

D → G → C

or another route that prepares a minor cadence.

For example:

Cm → Cm/B → Cm/B♭ → Am7♭5 → D7 → Gm

depending destination.

The chromatic descent can feed functional harmony.