Baudio Experiment

ambient.001.js

let c3 = 130.81
let c4 = 261.63
let e3 = 164.81
let e4 = 329.628
let b2 = 123.47
let b4 = 493.88

let melody1 = [c3, e3, b2, c3]
let melody2 = [e4, e4, b4, c4]
let melody3 = [[e4, 3], [e4, 4], [b4, 2], [c4, 6]]
let melody4 = [c3, e3, b2]

const saw_ = (x, t) => t % (1 / x) * x * 1 - 1
const sin_ = (x, t) => Math.sin(2 * Math.PI * t * x)
const tri_ = (x, t) => Math.abs(1 - t % (1 / x) * x * 2) * 2 - 1

return function (t, i) {
  t *= 40 / 60

  let a1 = melody1[Math.floor(t / 8) % melody1.length]
  let a2 = melody2[Math.floor(t) % melody2.length]
  let a3 = melody3[Math.floor(t) % melody3.length]
  let a4 = melody4[Math.floor(t / 4) % melody4.length]

  let saw = x => saw_(x, t)
  let sin = x => sin_(x, t)
  let tri = x => tri_(x, t)

  let reverb = 0.5

  if (t > 64) {
    reverb = 0
  } else if (t > 32 && t < 48) {
    reverb = Math.floor(t * 2) % 12
  } else if (t > 24 && t < 64) {
    reverb = Math.floor(t * 3) % 6
  } else if (t > 8) {
    reverb = Math.floor(t * 3) % 3
  }

  return (
    sin(a1) * 0.03 * (t < 80) +
    sin(a2) * tri(reverb) * 0.05 * (t < 80) +
    sin(a3[0]) * saw(a3[1]) * 0.1 * (t > 24 && t < 64) +
    sin(a4) * saw(2) * 0.5 * (t / Math.pow(2.2, t * 0.1)) * (t > 80)
  )
}