purdie_shuffle_sonicpi.rb

# Purdie 'Sonic Pi' Shuffle
# https://careerdrummer.files.wordpress.com/2012/06/purdie-half-time-shuffle.jpg

def triplet(pattern = [1,1,1])
  pattern.each { |pulse| yield if pulse; sleep 0.333 }
end

def quaver(pattern = [1,1])
  pattern.each { |pulse| yield if pulse; sleep 0.5 }
end

def crotchet
  yield
  sleep 1
end

use_bpm 130

in_thread do
  live_loop :hihat_foot do
    cue :first_beat
    4.times { crotchet { sample :drum_cymbal_pedal, rate: 1 } }
  end
end

in_thread do
  live_loop :hihat do
    sync :first_beat
    4.times { triplet([1,nil,1]) { sample :drum_cymbal_closed, rate: 1 } }
  end
end

in_thread do
  live_loop :snare do
    sync :first_beat
    sleep 2
    crotchet { sample :drum_snare_soft, rate: 1, attack: 0 }
    sleep 1
  end
end

in_thread do
  live_loop :grace_snare do
    sync :first_beat
    4.times { triplet([nil,1,nil]) { sample :drum_snare_soft, rate: 1, amp: 0.2 } }
  end
end

in_thread do
  live_loop :kick do
    sync :first_beat
    triplet([1,nil,nil]) { sample :drum_heavy_kick, rate: 1 }
    triplet([nil,nil,1]) { sample :drum_heavy_kick, rate: 1 }
    sleep 1
    triplet([nil,nil,1]) { sample :drum_heavy_kick, rate: 1 }
  end
end

Sounds awesome! Should the rest 1 on line 54 be a sleep 1?

@MrHarcombe - good spot - fixed now! So much fun - need to understand all these properties you can attach to samples to make it sound a bit more natural