Robotic runs happen when the lyric DEMANDS ornamentation the melody can't support — Suno then executes runs like a machine. Natural runs come from suggestion, not notation.
1. Never write out runs. Don't write 'yeah-eh-eh-eh-ah' — that's how you get robot scales. Write the plain word ('yeah') and let the vocalist choose the ornament.
2. Invite runs in the bracket:
[Chorus: soulful vocalist, expressive runs, gospel-inflected riffs]
'Expressive' and the tradition name ('gospel-inflected,' 'R&B runs') guide the STYLE of ornament.
3. Give it room. Runs need space — a syllable held for two beats invites a run; eight syllables in two beats forbids it. Sparse lyrics at emotional peaks = runs happen naturally.
4. Reference the feel: Aretha-style soul runs, 90s R&B vocal ornamentation — tradition names beat technical descriptions.
5. Less is more. One killer run per chorus beats runs on every line. If everything's ornamented, nothing is — and it all sounds mechanical.
Good luck! Hank founder of SonorixPG