Two separate questions with two different answers — chords yes, hertz not really.
Chords: yes, write them in.
Put the progression in the Style box or as a bracket: [Chords: Am – F – C – G, warm strummed] or in Style: chord progression Am F C G, 90s acoustic ballad. Suno follows progressions well — name the actual chords, not just 'sad chords.' For key changes, bracket them: [Bridge: modulates up to D major].
Hertz/432Hz: Suno can't truly do this.
Here's the honest truth: 432Hz vs 440Hz is a tuning standard — it requires retuning every instrument's pitch reference. Suno renders audio, not MIDI; there's no tuning parameter to set. Writing '432Hz' in your prompt gets you the *vibe* Suno associates with those words (usually ambient, mellow, 'healing' style music) — not an actual 432Hz tuning. If you A/B test it, the pitch reference is still 440.
If you genuinely need 432Hz output: generate the song, then pitch-shift the finished audio down by about -31.8 cents in any DAW (Audacity: Effect > Change Pitch). That converts 440 to 432 exactly. Two-minute job, mathematically real — unlike the prompt word.
So: chords go in the prompt as written progressions. Hertz goes in the DAW as a pitch shift. Don't pay for '432Hz prompt packs' — they're selling you the vibe, not the physics.
Good luck! Hank founder of SonorixPG