-- http://ccrma-mail.stanford.edu/pipermail/stk/2007-January/000327.html (pc)
let t4 = 7.9365079365
    rvb i =
      let d = mce [0.0297, 0.0371, 0.0411, 0.0437]
          c = mix (combN i 0.05 d t4 * 0.25)
          f = (allpassN c 0.01 0.005 0.096835)
      in allpassN f 0.01 0.0017 0.032924
    mk_env z0 t0 z1 t1 t2 z2 t3 c =
      let z = [z0, z1, z1, z2, z2]
          t = [t0, t1, t2, t3]
          e = Envelope z t [c, c, c] Nothing Nothing 0
      in envGen kr 1 1 0 1 RemoveSynth e
    mk_saw f0 f1 l =
      let f = mk_env f0 t0 f0 t1 t2 f1 (t3 + t4 + t5 + t5) EnvLin
          g = mk_env 0 t0 0.1 (t1 + t2 + t3) t4 0.0 (t5 + t5) EnvLin
          s = saw ar f
          t0 = 0.035
          t1 = 0.2267573696
          t2 = 2.2675736061
          t3 = 6.8027210884
          t5 = 1.75
      in pan2 s l g
    sig =
      let n = 30
          l = mceChannels (X.randN n (-1) 1)
          f0 = mceChannels (X.randN n 200 800)
          f1 = take n (cycle [29, 87.5, 116, 175, 233, 350, 524, 880, 1048, 1760])
      in sum (zipWith3 mk_saw f0 f1 l)
in rvb sig