Custom wave shaper node curve

custom-wave-shaper.js

// Creates a curve that goes from -1, -1 to 1, 0.
const makeLfoAmpCurve = function() {
  let n_samples = 44100;
  let curve = new Float32Array(n_samples)
  let i = 0;
  for ( ; i < n_samples; ++i ) {
    curve[i] = i / (n_samples - 1) - 1;
  }
  return curve;
};

const lfoAmpWaveShaper = audioCtx.createWaveShaper();
lfoAmpWaveShaper.curve = makeLfoAmpCurve();