32.19Level 4 — bass constant, one inner voice changes

Hold E♭ bass.

Keep RH:

D♭ and A♭.

Move:

F → G.

So:

D♭-F-A♭

becomes:

D♭-G-A♭.

Hear how one semitone changes the sonority.

Then perhaps:

G → F.

This is microscopic harmonic movement.