Sound Design and Event Cues

The film uses synthesized music and effects without speech narration. audio/score.py builds the score with NumPy/SciPy at 48 kHz stereo. The retained script does not load outside audio samples or invoke a music-generation API.

The v5 pulse is 104 BPM. Earlier notes referred to 92 BPM; that is not the current BPM value. Music tempo is distinct from particle speed and caption-reading time.

One timing map for picture and sound

src/timeline.json contains story-time sound events and the story-to-film mapping. The score's F(s) interpolation places events on the audio timeline. The visual program uses the inverse mapping.

All ranges below are story coordinates, not playback timestamps. The 0–102 s story maps to approximately 146.0508 s of film. Synthesis adds one second of audio tail; the encode governs delivered film length. Regenerate the timeline before rebuilding audio when captions or timing change. Rendering instructions describe the order.

Musical arc

Story range	Sound palette	Narrative job
0–22 s	Soft harmonic bed, plucked pulse and a gradually established low beat	Establish the device and charge-control logic
22–34 s	Receding pulse, rising noise and transition accents	Support extrusion and the electrolyte view
34–60 s	Low drone, granular texture and sparse bells	Give the interface more space
60–78 s	Pulse and bass return with greater rhythmic energy	Support the comparative task
78–88 s	Tighter low pulses, dissonance and noise	Build tension for the failure illustration
88–102 s	Reduced tension and harmonic resolution	Leave room for limitations and the final chain

Event cues

Event	Synthesized response	Intention
Cross-section drawing	Short band-limited noise strokes	Give construction a tactile rhythm
Field and channel formation	Low hum, gathering texture and a threshold accent	Mark a state change without speech
Electron drift	Fine noise texture	Support motion without crowding the text
Extrusion into 3D	Broad whoosh and low-frequency movement	Connect depth to the transition
Ion redistribution and EDL formation	Granular ticks followed by a low paired accent	Distinguish motion from an established interface
Camera dive	Riser and arrival accent	Make scale change audible
Voltage comparison	Rising tones at different ranges	Reinforce voltage indicators
Defects and breakdown	Sparse crackles, short zap and heavier impact	Emphasize the schematic sequence
Flattening and ending	Settling sound and harmonic close	Return to the opening idea

At selected impacts, the script lowers music beneath effects and adds a synthesized reverberation response. The packaging pipeline uses loudness normalization targeting −16 LUFS and a −1.5 dBTP ceiling. These are processing targets, rather than a claim that every historical encode was independently measured to match them.

The sounds are editorial cues, not recordings of ions, fields or a real breakdown event. They support explanation without serving as physical evidence.