This sonic pi v2.8 code will generate euclidean loops as wav files from source samples. This is inspired by Micah Frank and this post: http://puremagnetik.com/post/133330599365/ableton-live-pack-clips-electronic-beats-loops-csound

sonic-pi-euclidean-loop-wave-file-generator.rb

###################################################################################################################
# WARNING!  Don't stop this script.  It is best just to let this script stop itself :-)  
#           If you stop this while it is running and recording, the temp file will keep growing and 
#           eventually fill your hard drive!  If you do happen to stop it, you can either run this 
#           file again or run these lines in a separate buffer:
#               client = SonicPi::OSC::UDPClient.new('localhost', 4557)
#               client.send("/stop-recording")
#               client.send("/delete-recording")
###################################################################################################################


#options
writeFiles = true
numberOfloopsToGenerate = 4
numberOfBeatsInLoop = 4
outputDir = File.expand_path("~/Downloads")

#the source samples to slice
samples = [:guit_harmonics, :guit_e_fifths, :ambi_piano]
#samples = Dir.glob("/path/to/wav/files/*.wav")

#osc client controls recording
client = SonicPi::OSC::UDPClient.new('localhost', 4557)

#just in case a previous recording was started but not stopped
client.send("/stop-recording")
client.send("/delete-recording")

#generate euclidian loops with slices of samples
numberOfloopsToGenerate.times do
  use_random_seed Time.now.to_i
  bpm = rrand_i(60, 110)

  #pick 6 samples if there are more than 6
  rndSamples = samples.length > 6 ? Array.new(6).collect{choose(samples)} : samples
  starts = Array.new(6).collect{rand(1)}
  amp = 2
  rate = 1
  attack = 0.01
  decay = 0.2
  load_samples rndSamples

  live_loop :loop1 do
    use_bpm bpm
    sample rndSamples[0], attack: attack, decay: decay, sustain_level:0, start: starts[0], rate: rate, amp: amp
    sleep 1.125
  end

  live_loop :loop2 do
    use_bpm bpm
    sample rndSamples[1], attack: attack, decay: decay, sustain_level:0, start: starts[1], rate: rate, amp: amp
    sleep 0.25
  end

  live_loop :loop3 do
    use_bpm bpm
    sample rndSamples[2], attack: attack, decay: decay, sustain_level:0, start: starts[2], rate: rate, amp: amp
    sleep 0.66
  end

  live_loop :loop4 do
    use_bpm bpm
    sample rndSamples[3], attack: attack, decay: decay, sustain_level:0, start: starts[3], rate: rate, amp: amp
    sleep 2.25
  end

  live_loop :loop5 do
    use_bpm bpm
    sample rndSamples[4], attack: attack, decay: decay, sustain_level:0, start: starts[4], rate: rate, amp: amp
    sleep 3.75
  end

  live_loop :loop6 do
    use_bpm bpm
    sample rndSamples[5], attack: attack, decay: decay, sustain_level:0, start: starts[5], rate: rate, amp: amp
    sleep 3.0
  end

  # The wav file recordings always have ~1.5 seconds of silence at the beginning - I assume this is because of
  # the time it takes to communicate with backend server, load samples, and run this code?!?!
  client.send("/start-recording") unless !writeFiles
  sleep numberOfBeatsInLoop #this is where you can end up with large temp files - if you stop running while sleeping after start-recording
  client.send("/stop-recording") unless !writeFiles
  client.send("/save-recording", "123", "#{outputDir}/sonic-pi-recording-#{Time.now.to_i}.wav") unless !writeFiles

end

#stop everything when done generating loops
client.send("/stop-all-jobs")