22.42Add extensions

Try:

Dm9 → D♭13 → Cmaj9

Possible voicings:

Dm9: LH D RH F-C-E

D♭13: LH D♭ RH F-B-B♭/E♭ depending color

Cmaj9: LH C RH E-B-D

Don't chase one canonical shape.

Keep:

• 3rd
• 7th
• desired extension
• melody

and voice-lead smoothly.