This document specifies the complete audio direction for Tao Baryon — per-sector music architecture, the dynamic music layering system, the SFX catalog, voice transmission design, and the audio philosophy that ties everything to the game's narrative.
Every significant game event has a sound. The player should be able to close their eyes during a boss phase transition and know exactly what happened from the audio alone. The audio system reinforces the game's core tension: order vs. dissolution, matter vs. doctrine, physics vs. theology.
Sector 1 sounds like a military operation. Sector 5 sounds like physics breaking. The progression from sector to sector is as much an audio journey as a visual one. By Stage 30, the player should feel — from the music alone — that they have traveled an enormous distance from where they started.
The 8-second silence after Halen's death is authored. Depth 1000 in endless mode ends in sub-bass only. The FTUE uses no music — only Sira-Vel's voice and ambient station sounds. Silence is used deliberately, not by accident.
Each sector has a base music track composed in layers. The game's audio engine mixes these layers dynamically based on gameplay state:
| Layer | Description | Active when |
|---|---|---|
| Base | Ambient/atmospheric foundation | Always active |
| Tension | Melodic layer, mid-register | Enemy wave active |
| Combat | Rhythmic percussion + bass drive | Enemies firing at player |
| Intensity | Full orchestral/synth peak | Combo multiplier ≥ 5× |
| Crisis | Distorted/broken version of base | Player HP ≤ 25% |
Layers crossfade smoothly (1–2 second transitions). The player hears a seamless composition that responds to their play state without jarring cuts.
Each boss has a dedicated track that replaces the stage track entirely. Boss tracks do not use the layered system — they are composed as a single dramatic piece with three internal phases matching the boss's HP thresholds:
Transition between boss phases: 0.5s fade to silence, then the next phase begins. This silence is the beat before the storm.
Tone: Military procedural. Tense but controlled. The player is a professional doing their job.
Instruments: Low synth bass, processed electric piano, sparse percussion, occasional high strings.
Base layer: A slow arpeggiated synth pattern — constant but not aggressive. The Frontier is boring until it isn't.
Combat layer: Percussion enters — mid-tempo, mechanical. Snare pattern mimics a military march but abstracted.
Intensity layer: Strings rise. Still controlled — not panic, just heightened alertness.
Key musical motif (Frontier Theme): A 4-note ascending phrase in minor key. Heard here first. Returns in Sector 5 in a broken, distorted form.
Boss — Reverent Maelin:
Tone: Weariness and depth. The war has been here longer than anywhere. The dust of long combat.
Instruments: Deeper synth bass, processed guitar (distorted but mournful), layered vocal pads (wordless), heavier percussion.
Base layer: A slow oscillating bass drone. The Reach is vast and patient.
Combat layer: Guitar enters — angular, interrupted rhythms. Not pretty, just effective.
Intensity layer: Vocal pads rise. The voices are recognizably Telos in character — the enemy's musical language, heard from a distance, filtered through static.
Key musical motif (Veiled Contact): A new 3-note descending phrase, first heard in Stage 9. Soft, mysterious. This is the first hint of Veiled musical identity.
Boss — Final Chorus:
Tone: Strange beauty. The enemy has culture, art, depth. The music acknowledges this.
Instruments: Veiled-influenced — unusual scales, non-Western tunings, haunting melodic lines. Hybrid of human electronic and Telos choral.
Base layer: A slow melodic phrase in a scale that feels almost-but-not-quite familiar. Unnerving and beautiful simultaneously.
Combat layer: Rhythm enters — complex time signatures (7/8, 5/4). The Telos fight in liturgical time, not military time.
Intensity layer: Full hybrid texture — electronic and choral simultaneously. The alliance is forming in the music too.
Veiled Theme: A distinctive melodic phrase introduced here. Gentle, reflective, slightly out of tune with everything else — the Veiled are between two worlds and the music says so.
Boss — Inquisitor Cohort:
Tone: Gravitational. Something vast is pulling everything. The music bends toward it.
Instruments: Deep sub-bass tones (physical, felt as much as heard), sustained strings, cosmological drones. Occasional electronic glitches — the physics is beginning to show strain.
Base layer: A sub-bass drone. Not a note — a presence. The Apparatus.
Combat layer: Strings enter in sustained clusters. Not melodic — textural. The combat is not normal anymore.
Intensity layer: Electronic layers over the strings, glitching occasionally. The 5× combo triggers something that sounds like the fabric of the music is stretching.
Crisis layer (HP ≤ 25%): The glitches intensify. The base drone shifts pitch slightly. The music is beginning to break.
Frontier Theme returns: In the Intensity layer, a fragmented version of the Sector 1 4-note motif appears — distorted, slowed, like a memory from far away.
Boss — Mathematician-Saint Voren:
Tone: Physics breaking. Not dramatic — inevitable. The music is decomposing.
Instruments: Everything from previous sectors, but degraded. Strings that drift from pitch. Bass drones that shift unexpectedly. Choral fragments that cut off mid-phrase. Electronic layers that glitch into noise.
Base layer: The Apparatus drone — the sub-bass from Sector 4, now louder, more present, slightly irregular. Not constant — it breathes.
Combat layer: Fragments of previous sector combat themes, overlapping incorrectly. The Telos enemies are fighting in liturgical patterns that no longer cohere.
Intensity layer: At 5×+ combo: a brief, clean statement of the Frontier Theme — in full, the way it sounded in Stage 1. Then it dissolves back into the chaos. The player is still themselves, even here.
Crisis layer: Pure noise — structured noise, not random, but barely musical.
Boss — Architect-Saint Halen:
This is the most important music in the game.
Pre-fight: The Apparatus drone fades to silence. 3 seconds of nothing. Then a single tone — piano, not electronic. Pure. Out of place. Halen's humanity, audible before the fight begins.
Phase 1 — Architect's Opening: The piano theme develops into a full composition — chamber orchestra, precise, elegant, slightly melancholy. This is what Halen sounded like 800 years ago. Beautiful and enormous.
Phase 2 — Integrated Mind: The chamber orchestra fragments. Each instrument continues, but they no longer coordinate. An uploaded consciousness that has been alone for 800 years — the instruments keep playing but they've forgotten how to listen to each other. Underneath, the Apparatus drone rises.
Phase 3 — Final Calculation: Near silence. Only the Apparatus drone and one sustained piano note. The simplest thing left. Halen at the end of everything he built.
Death sequence (8-second silence): The piano note dies. The drone dies. Nothing. 8 seconds. Then, at second 9: the Veiled Theme — gentle, in full, played cleanly for the first time. The Witnesses are here.
Depth 1–50: Sector 5 base layer theme, looping Depth 50–150: Music layers drop out one by one (combat, intensity, then tension) Depth 150–300: Only the Apparatus drone remains, with occasional choral fragments (Telos liturgical, distorted) Depth 300–500: Drone only, with irregular glitch events Depth 500–1000: Near-silence. Sub-bass pulses matching the combat density Depth 1000+: Pure sub-bass. The sound of gravity.
| Weapon | Fire Sound | Impact Sound | Overheat Sound |
|---|---|---|---|
| W1 Pulse Cannon | Short crisp plasma pop, 220Hz base | Soft electric sizzle | Mid-tone buzz, 0.5s |
| W2 Inertial Lance | Heavy kinetic crack — sharp transient | Deep metallic thud | N/A (negligible heat) |
| W3 Coherence Beam | Sustained high-frequency hum, rises in pitch with sustain | Continuous sizzle | Sharp cutoff + descending whine |
| W4 Hawking Bolt | Low thrum on fire, rising pitch as it travels | Bass explosion + high-freq burst on detonation | N/A (per-shot CD) |
| W5 Penrose Lance | Sustained rising tone, builds in volume with distance | Deep resonant boom | Descending oscillator |
| W6 Anomaly Field | Dissonant chord on deploy | Continuous subtle distortion | N/A (cooldown) |
| W7 Cosmic String Spear | Near-silent on fire (tension) | Crack of thunder 0.3s after impact (delayed — sound can't travel faster than light, the game respects this) | N/A (per-shot CD) |
| W8 Boltzmann Cascade | Random from pool of 5 fire sounds matching pattern type | Pattern-dependent | Mid-tone buzz |
Heat system audio:
| Special | Deploy Sound | Active Sound | End Sound |
|---|---|---|---|
| S1 Singularity Pull | Deep bass drop | Low oscillating hum | Implosion click |
| S2 Phase Shift | Quantum shimmer (high-freq) | Subtle frequency shift in all game audio (very slight) | Return shimmer |
| S3 Time Dilation Field | Sustained descending tone | Everything in the field plays at 70% pitch | Field collapse — pitch snaps back |
| S4 Cherenkov Burst | Blue-flash crack | Engine sound rises sharply in pitch | Fade back to normal engine |
| S5 Vacuum Pulse | Expanding ring sound — deep then high | — | Silence |
| S6 Penrose Charge | 1s wind-up rising tone | — | Single massive impact |
| S7 Coherence Field | Geometric click pattern | Shield hum | Shield break or fade |
| S8 Vacuum Bloom | Dissonant chord | Expanding distortion field | Implosion |
| Category | Spawn Sound | Fire Sound | Death Sound |
|---|---|---|---|
| Grunts (G1–G5) | Brief presence tone (scales with tier) | Plasma pop variants | Pop + debris |
| Strafers (S1–S2) | Engine rev | Fast plasma stutter | Explosive crack |
| Bombers (B1–B5) | Heavy engine thud | Delayed-detonation launch | Large explosion, bass-heavy |
| Snipers (Sn1–Sn3) | High-frequency charge tone | Sharp crack | Mid-range explosion |
| Kamikaze (K1–K4) | Accelerating engine tone | N/A | Massive explosion + shockwave |
| Elites (E1–E4) | Distinctive musical sting (4 unique stings, one per elite type) | Heavier versions of base patterns | Cinematic death sound + 0.5s silence |
| Event | Sound |
|---|---|
| Player spawn | Brief soft tone — presence |
| Damage taken | Metallic impact + brief shield-crack |
| Shield absorbed | Clean click + brief hum |
| Death | Bass implosion — not dramatic, just final |
| Pickup collect | Gentle ascending chime (pitch varies per pickup type) |
| Combo increment | Subtle tick (higher pitch with multiplier level) |
| Combo reset | Soft descending tone |
| 10× combo reached | Brief musical sting — a clean statement of the Frontier Theme's first two notes |
| Event | Sound |
|---|---|
| Boss entrance | Dedicated musical sting (unique per boss) + sub-bass hit |
| Phase transition warning (70%/40%) | 2-second warning tone begins |
| Phase transition | 0.5s silence + new phase music begins |
| Boss death | Dedicated cinematic death sound per boss. Halen: implosion that does not resolve into debris sounds — just fades. |
| Event | Sound |
|---|---|
| Button tap | Clean click, 20ms |
| Tab switch | Soft whoosh |
| Build complete | Ascending chime (3 notes) |
| Rank up | Musical sting (longer — this is earned) |
| Achievement unlock (Bronze/Silver/Gold) | Ascending double-tone |
| Achievement unlock (Platinum) | Full 4-note chime, slightly reverbed |
| Codex entry unlocked | Soft page-turn + single tone |
| Stage clear | Clean major chord resolution |
| Hub ambience | Distant machinery, muffled conversation, occasional airlock |
08_bosses.md for full dialogue trees.Recommended package: just_audio (already used in Radio LOGOS project) for music with layering support. flame_audio for positioned SFX during gameplay.
Music layers are pre-composed as separate audio files and mixed in real-time via volume control. Each layer is a looping track of identical length — the engine fades volumes rather than starting/stopping tracks, ensuring seamless transitions.
.mp3 (compressed) for distribution size. Master in .wav / .flac..mp3 for longer sounds, .wav for sub-100ms transients (lower decode latency)..mp3, recorded at 44.1kHz 16-bit minimum.When many SFX trigger simultaneously (dense combat), priority order for audio mixing:
just_audio + flame_audio, layers as parallel looping tracks mixed by volumeDocument version: 1.0 (locked) Part of: Tao Baryon GDD — Tier 5 Audio & Visual