Band-limited PolyBLEP VCO → tube-ish saturation (no libs, single HTML)

stopped
(both are band-limited)
Higher drive increases saturation and harmonic density.
Adds subtle even harmonics (tube-ish asymmetry). Keep modest.
Lower tone = darker/less fizz. 8–14 kHz is a good range.

Note: AudioWorklet requires http(s). Run a local server: python3 -m http.server then open http://localhost:8000.