How it works:
Multipole ℓ maps to audio frequency via log-log scaling (ℓ=2 → 40 Hz, ℓ=6000 → 8 kHz).
Shaped Noise filters white noise to match Dℓ.
Additive sums sine tones weighted by √Dℓ.
Scale Layers splits into drone (ℓ<100), harmonics at CMB acoustic peaks, and high-ℓ noise.
ℓ-Sweep animates a bandpass window across scales.
Build-Up progressively adds CMB → tSZ → CIB.
ν-Sweep crossfades 93 → 143 → 353 GHz.
Stereo modes put components or frequencies in separate ears (use headphones!).
Click the sky map to modulate amplitude by local variance.
Orange dots are the 3000 most massive galaxy clusters (M>5×1014 M⊙).
Click near one to hear a ping — pitch encodes halo mass (heavier = higher).