Code Music Studio で音楽をプログラミングしてみるテスト

return function (t) {

var notes = [];
   for (var i = 0; i <= 12; i ++) notes.push(2*440 * Math.pow(2,i/12))

var sequence = [0, 2, 4, 5, 7, 9, 11];

function note(x) {
     if (x == null) return
     x -= 1;
     return notes[sequence[(x + 7 * 1000) % 7]] * Math.pow(2, Math.floor(x / 7))
   }

var n
   var mario = [3, 3, n, 3, n, 1, 3, n, 5, n, n, n, -2, n, n, n,
     1,n,n,-2,n,n,-4,n,n,-1,n,0,n,-1,-1,n,-2,3,n,5,6,n,4,5,n,3,n,1,2,0,n,n,n,
     1,n,n,-2,n,n,-4,n,n,-1,n,0,n,-1,-1,n,-2,3,n,5,6,n,4,5,n,3,n,1,2,0,n,n,n,
     n,n,5,5,4,2,n,3,n,-2,-1,1,n,-1,1,2,n,n,5,5,4,2,n,3,n,8,n,8,8,n,n,n,
     n,n,5,5,4,2,n,3,n,-2,-1,1,n,-1,1,2,n,n,3,n,n,2,n,n,1,n,n,-2,-2,n,-6,n,
     1,1,n,1,n,1,2,n,3,1,n,-1,-2,n,n,n,
     1,1,n,1,n,1,2,n,3,n,n,n,n,n,n,n,
     1,1,n,1,n,1,2,n,3,1,n,-1,-2,n,n,n]

var v = 10
  var index = Math.floor(t * v) % mario.length
  var velocity = 1 - (t * v) % 1

return sawtooth(note(mario[index])) * velocity;

function sawtooth(x) {
    var n = x * t
    return 2*( Math.pow(n % 2 - 1,2)-0.5)
  }
}