docs(decisions): record audio discussion outcomes D-067 through D-074

Recognition chime timing (D-067), 5-bus audio architecture (D-068),
audio dip profiles (D-069), confrontation as cognitive vulnerability
(D-070), monologue chime placeholder strategy (D-071), universal
conversation murmur (D-072), zone crossfade (D-073), hybrid audio
generation (D-074). Amends D-038 scope, resolves Q-014.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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co-authored by Claude Opus 4.6
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# Content Decisions
How narrative, NPCs, and world content are created: content tiers, NPC generation, templates, dialogue, population.
How narrative, NPCs, and world content are created: content tiers, NPC generation, templates, dialogue, population, audio aesthetic identity.
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@@ -142,6 +142,22 @@ How narrative, NPCs, and world content are created: content tiers, NPC generatio
- **Raised by:** Paula (three phases + KG recording), Stig (WASD mechanic + 300ms fade), Ozzie (consequences), Nigel (tolerance per seed)
- **Dissent:** None.
### D-074: Audio aesthetic identity — insert-tech vs organic
- **Date:** 2026-02-16
- **Decision:** Audio design uses two sonic families with distinct aesthetic identities:
- **Insert-tech sounds:** Synthetic, precise, clinical, no reverb. Monologue chimes ([D-038](scope.md#d-038-audio-in-v01-scope--8-files-via-stable-audio-open) assets 7-8), UI feedback, future: lattice interface sounds, biometric scan confirmations. Represents neural lattice interface — artificial, computational, clinical.
- **Organic sounds:** Warm, breathy, natural decay, environmental reverb. Footsteps, ambient layers, NPC movement, environmental events. Represents human cognition and physical reality — warm, imperfect, lived-in.
- **Thematic mapping:** Insert-tech = neural lattice (computational precision, trustworthy but inhuman). Organic = human cognition and environment (warm, ambiguous, interpretive). Maps to [D-018](perception.md#d-018-three-range-sound-model) trust model: close/organic sounds = reliable, long-range/insert sounds = potentially compromised.
- **Station palette — "functional warmth":**
- Low-freq foundation (60-120Hz): station hum, span gate vibration, machinery drone.
- Mid-freq texture (200-800Hz): footsteps, object handling, conversation murmur.
- High-freq detail (2-8kHz, sparse): scanner pings, metal impacts, environmental detail.
- No harsh frequencies, no industrial brutality. The station is SETTLED — lived-in, maintained, comfortable enough to be complacent.
- **Environmental neutrality per [D-045](perception.md#d-045-art-direction--environmental-neutrality-strict-zero-shift):** Ambient audio does NOT shift with narrative state. Same station hum before and after conspiracy discovery. No music stingers for investigation progress. Emotional weight comes from monologue and player knowledge, not audio cues.
- **Cross-reference:** Audio assets ([D-038](scope.md#d-038-audio-in-v01-scope--8-files-via-stable-audio-open)), sound model ([D-018](perception.md#d-018-three-range-sound-model)), environmental neutrality ([D-045](perception.md#d-045-art-direction--environmental-neutrality-strict-zero-shift)), setting ([D-036](#d-036-sova-transit-district--krenn-system-as-v01-setting))
- **Raised by:** Inigo (insert-tech/organic split), Paula (cognitive architecture framing and trust model connection)
- **Dissent:** None
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*14 decisions. Last updated: 2026-02-13*
*15 decisions. Last updated: 2026-02-16*