Für Elise Javascript

fur_elise.js

// Mostly Inspired by https://github.com/KilledByAPixel/1Keys

var octave = 1
var key = 0
var shape = 'sine'
var audioCtx = new AudioContext();
var instruments = [ "1", "2", "4", "8" ]
var soundDuration = 250

play = (i) => {
  if (i < 0) return;

  instruments.map(j => {
    oscillator = audioCtx.createOscillator()        // create oscillator
    oscillator.connect(                             // oscillator to gain
      oscillator.g = audioCtx.createGain(           // create gain node
        oscillator.frequency.value =                // set frequency
          j * 55 *                                  // A 55 root note
          2**((i+3)/12                              // music scale formula
              + octave*1                            // octave control
              + key/12)))                           // key control
          .connect(audioCtx.destination)            // gain to destination
    oscillator.g.gain.value = .2/(1+Math.log2(j))   // set gain
    oscillator.type = shape                         // get type setting
    oscillator.start()                              // play sound
    oscillator.g.gain.linearRampToValueAtTime(oscillator.g.gain.value, audioCtx.currentTime + 0)
    oscillator.stop(audioCtx.currentTime + soundDuration / 1000)
    return oscillator
    }
  )
}

playMusic = (s) => {
  time = 0
  s.split(" ").map((e) => {
    setTimeout(() => play(parseInt(e)), time * soundDuration)
    time++;
  })
}

// Partition in progress
s = "23 22 23 22 23 17 21 19 16 -1 36 28 33 35 -1 28 32 35 36 -1 23 22 23 22 23 17 21 19 16 -1 36 28 33 35 -1 28 36 35 33"
playMusic(s)