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Audio plan: header configures voice, payload sings the melody

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2026-03-22 09:11:02 +00:00
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AUDIO-PLAN.md
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## Mapping Design
### Melody from Raw Bytes
- Each byte (0-255) quantized to a musical scale across 2-3 octaves
- NOT chromatic (too chaotic) — use pentatonic or modal scales
- First N bytes of the packet = a short melodic phrase
- **Header bytes configure the voice** — payload type selects instrument/scale/key (see below), flags and transport codes select articulation and envelope shape. Header bytes are NOT played as notes.
- **Payload bytes are the melody** — evenly sampled and quantized to a scale:
- Note count = `sqrt(payload_length)`, so proportional to packet size:
- 16-byte payload → 4 notes
- 36-byte payload → 6 notes
- 64-byte payload → 8 notes
- Bytes selected via even spacing across the full payload (not just first N) — represents the whole packet's "shape"
- Each byte (0-255) quantized to the scale selected by payload type, across 2-3 octaves
- NOT chromatic (too chaotic) — pentatonic or modal scales
- Note timing: ~150-200ms per note, so 4-8 notes = 0.6-1.6 seconds per packet
- Different payload types get different scales:
- **ADVERT** → major pentatonic (bright, announcing, beacon-like)
- **GRP_TXT** → minor pentatonic (conversational, human)