Darkwave-like Guitar Arp on 31 EDO/TET (Strudel REPL)

guitar-arp-31edo.strudel.js

let tuning = 216
let root = 216
let edo = 31
let tempo = 135
let signature = 4
let ratio = Math.pow(2, 1/edo)
let frequencies = Array.from(
  { length: edo },
  (_, semitone) =>
    root * Math.pow(ratio, semitone)
)
let arpSize = 6
let loops = 40
let randomBetween = (min, max) =>
  Math.floor(Math.random() * (max - min) + min)
let createRandomArp = (step, size) => {
  let startValue =
    randomBetween(arpSize, edo - arpSize)
  let result = []
  let index = 0
  for (index = 0; index < size; index += 1) {
    result.push(startValue + (step * index))
  }
  return [].concat(result, result)
}
let playbook = [].concat(...Array.from(
  { length: loops },
  _ => Math.random() > 0.35 ?
    createRandomArp(1, arpSize) :
    createRandomArp(-1, arpSize)
)).map(semitone => semitone.toString())
$: i(slowcat(...playbook))
  .tune(frequencies)
  .mul(tuning)
  .freq()
  .sound("gm_electric_guitar_muted")
  .soft("1:0.5")
  .legato(0.75)
  .cutoff(1500)
  .resonance(1)
  .compressor("-20:5:5:0.001:0.5")
  .cpm(tempo/signature)
  .fast(signature * 2)
  .chorus(0.7)
  .room(0.1)
  .delay(0.1)
  .postgain(0.8)
  .attack(0.01)
  .release(0.01)
  .log()
  ._pitchwheel({ edo: edo, root: root })