The final code of a personal algorave session with sonic pi. The result is here: http://www.newgrounds.com/audio/listen/745299

synthwave.rb

live_loop :bass do
  use_synth :prophet
  play_pattern_timed [:cs2, :d2, :g2].reverse, 0.5, cutoff: rrand(70, 90)
  play_pattern_timed [:cs2, :fs2, :e2].reverse, 0.5, cutoff: rrand(80, 100)
end

live_loop :thing do
  sample :bd_haus, cutoff: 90
  sleep 0.5
end

live_loop :snare do
  sample :drum_snare_soft, cutoff: 100
  sleep 1
  sample :drum_snare_soft, cutoff: 100
  sample :drum_snare_hard, cutoff: 100
  sleep 1
end