let waveform = '0000000000000000022222044440111110oooo0vvvvv0ffff011111000000000000000000dddd0ccccc0dddd0aaaaa099990aaaaa0aaaaa088880eeeee0eeee01111103333033333066666077770111110000000000000000000000000000'
var canvas = document.createElement('canvas')
document.body.appendChild(canvas)
var ctx = canvas.getContext('2d')
waveform.split('').forEach((item, i) => {
let height = parseInt(item, 32)+1
ctx.fillRect(i*5, 70-height, 3, height);
})