loop do
    s = synth [:bnoise, :cnoise, :gnoise].choose, amp: rrand(0.5, 1.5), attack: rrand(0, 4), sustain: rrand(0, 2), release: rrand(1, 3), cutoff_slide: rrand(0, 3), cutoff: rrand(60, 80), pan: rrand(-1, 1), pan_slide: 1, amp: rrand(0.5, 1)
    control s, pan: rrand(-1, 1), cutoff: rrand(60, 115)
    sleep rrand(2, 3)
  end

Link: https://sonic-pi-gallery.s3.amazonaws.com/449d949f23d128fd0b1face99bcf64be.wav