Original test fixture, generated September 25, 2026.
Live desktop Chromium results, gate -40 dB, transpose 0:
Minimum 40 ms: 26 notes. Minimum 100 ms: 15 notes. Minimum 400 ms: 0 notes.
Counts are observations, not real-music accuracy scores.

"""Generate our own synthetic test, not a real-music accuracy benchmark."""
import math
import struct
import wave
from pathlib import Path

dest = Path(__file__).resolve().parents[1] / 'dist' / 'examples'
dest.mkdir(exist_ok=True)
rate = 44100
sequence = [60, 62, 64, 65, 67, 69, 71, 72] * 2
samples = []
for note in sequence:
    hz = 440 * 2 ** ((note - 69) / 12)
    for i in range(round(rate * .16)):
        t = i / rate
        envelope = min(1, t / .01, (.16 - t) / .02)
        samples.append(.42 * envelope * math.sin(2 * math.pi * hz * t))
    samples.extend([0] * round(rate * .04))
with wave.open(str(dest / 'short-melody.wav'), 'wb') as output:
    output.setparams((1, 2, rate, len(samples), 'NONE', 'not compressed'))
    output.writeframes(b''.join(struct.pack('<h', round(x * 32767)) for x in samples))
print({'sample_rate': rate, 'notes': len(sequence), 'seconds': len(samples) / rate, 'midi_sequence': sequence})