CST — Audio→CSV • A:10–16 + B:6–16 (sum 32, non-overlap) • 60s Orchestrator • 32 Chairs

Audio file–

Audio → CSV Notes (60s)

Detected Key–

Detected BPM–

CSV headers: t,m,b (time sec, dominant MIDI, bass MIDI). Export → then load into A/B.

Load CSV Notes

Conductor / Musicalize

Key Root

Mode

BPM (Tempo)

Quantize

Swing (0–60%)

Humanize (ms)

Master Volume

Reverb Mix

Stereo Spread

GM Program (0–127) Global timbre (still allows per-chair micro-variants below).

Export Audio

White square lights when a 60s score is ready to export.

Cadence & Pace

Active cadenceEven

Active paceAndante

Family Opening (entry timing bias)

Open @ seconds (Strings, Winds, Brass, Perc) 0, 8, 16, 24

Orchestration Picks (A:10–16, B:6–16 • non-overlapping • total 32)

Target A (10–16)

Target B (6–16)

Counts auto-adjust to keep A + B = 32. Locks are respected.

A Selected0

B Selected0

Per-Chair Variants (tiny differences per A/B chair)

Chair

Variant

Detune

Variant tweaks tone/attack; detune is ± cents. Defaults: A (brighter) / B (warmer).

Ready.

Independent A+B → Arrange & Export CSV (self-contained)

BPM

Cadence

Swing (0–60%)

Profile

Status Load two ~1-minute songs.

SeatingEven spacing • Front strings, winds middle, brass back, perc rear • 32 chairs

How the 1-minute AI Symphony Orchestra works (HTML + Web Audio)

Load Audio and (optionally) click Analyze 60s to auto-detect notes & tempo.
Export CSV (t,m,b) then load CSV into A and/or B panels.
Choose A (10–16) and B (6–16). Total stays 32, no overlap. Locks respected.
Set Conductor/Key/Tempo/Quantize/Swing/Humanize/Reverb/Spread, plus Cadence & Pace.
Use Per-Chair Variants (bright/warm etc.).
Press Play for a 60s render; lights blink on sounding chairs. Export WAV to save audio.
Need to start over? Use Clear buttons (Audio / A / B) or Reset for a full reset.

Trumpets A

Back L

Trumpets B

Back L

French Horns A

Back M

French Horns B

Back M

Percussion A

Back C

Percussion B

Back C

Trombones/Tuba A

Back R

Trombones/Tuba B

Back R

Flutes/Picc. A

Winds

Flutes/Picc. B

Winds

Oboes A

Winds

Oboes B

Winds

Clarinets A

Winds

Clarinets B

Winds

Bassoons A

Winds

Bassoons B

Winds

Piano A

Keys

Piano B

Keys

Double Basses A

Back Strings

Double Basses B

Back Strings

Drums A

Rhythm

Drums B

Rhythm

Harp/Keys A

Right

Harp/Keys B

Right

1st Violins A

Far L

1st Violins B

Far L

2nd Violins A

L-Center

2nd Violins B

L-Center

Violas A

Center

Violas B

Center

Cellos A

R-Center

Cellos B

R-Center

Conductor

Conductor / Musicalize: Cinematic — lush

How the 32-Chair Symphony Works — Methods & Math (v1)

Pitch & Bass Detection: autocorrelation + zero-crossing estimate → MIDI map.
Key Detection: Krumhansl-Schmuckler profile correlation → best major/minor root.
Tempo: onset deltas → median IBI → BPM normalized to 60–180.
Quantize & Swing: snap to grid q = round(t/grid)*grid, odd positions get swing offset.
Routing: pitch range + family opening bias (Strings→Winds→Brass→Perc) to seats.
Scheduling: look-ahead event buffer streams notes to WebAudio buses.
Timbre: SoundFont playback per seat → panned buses → hall reverb + compressor.

Key:    argmax_r ⟨profile_r , histogram⟩
BPM:    bpm = clamp( round( 60 / median(Δonset) ) × 2^k , 60..180 )
Quant:  q(t) = round(t / grid) · grid;  swing: if odd grid → q += s·grid/2
Assign: section = f(pitch, isBass, familyOpen_t)
      

This is an early HTML-only AI symphony. As the codebase grows, it will fuse analyzer, arranger, orchestration, and rendering into a single unified pass.