db_drum_definition.rb

$clock.bpm = 175
$mutation = L{|measure| 0 == (measure - 1) % 2}
$measures = 4

probabilities = {}

# hip-hop
# probabilities[36] = [1.0, 0.0, 0.5, 0.25, 0.0, 0.6, 0.0, 0.9, 0.9, 0.0, 1.0, 0.0, 0.5, 0.0, 0.3, 0.0]
# probabilities[37] = [0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.3, 0.0, 1.0, 0.0, 0.0, 0.0]

# d&b
probabilities[36] = [1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0]
probabilities[37] = [0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 0.0]

# both
probabilities[38] = [0.2, 0.0, 0.3, 0.0, 0.3, 0.1, 0.3, 0.4, 0.0, 0.0, 0.2, 0.0, 0.4, 0.0, 0.0, 0.0]
probabilities[39] = [0.3, 0.0, 0.2, 0.6, 0.1, 0.0, 0.4, 0.1, 0.35, 0.15, 0.0, 0.0, 0.2, 0.0, 0.1, 0.0]
probabilities[40] = [0.0, 0.0, 0.2, 0.0, 0.4, 0.0, 0.0, 0.0, 0.2, 0.0, 0.3, 0.0, 0.3, 0.1, 0.3, 0.4]
probabilities[41] = [0.76, 0.0, 0.23, 0.0, 0.0, 0.0, 0.67, 0.0, 0.15, 0.0, 0.15, 0.0, 0.49, 0.0, 0.15, 0.0]
probabilities[42] = [0.75, 0.0, 0.13, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.13, 0.0, 0.23, 0.0, 0.0, 0.35, 0.0]
probabilities[43] = [0.9] * 16
probabilities[44] = [0.65] * 16
probabilities[45] = [0.85, 0.35] * 8

def note(midi_note_number)
  Note.create(:channel => 2,
              :number => midi_note_number,
              :duration => 0.25,
              :velocity => 100 + rand(27))
end

static = L{1.0}
dynamic = L{rand}
check_every_drum = L{|queue| queue[queue.size - 1]}
check_random_drums = L{|queue| queue[rand(queue.size)]}

notes = []
(36..45).each do |midi_note_number|
  notes << Drum.new(:note => note(midi_note_number),
                    :when => L{|beat| false},
                    # :number_generator => static,
                    :number_generator => dynamic,
                    # :next => check_every_drum,
                    :next => check_random_drums,
                    :probabilities => probabilities[midi_note_number])
end
notes