music dsl in ruby idea

music-dsl.rb

# song definition

tempo 120

# bassline

instrument :bass, channel: 2 do
  preset 'bass/fender_jazz_clean'
end

pattern :funky do
  note_filter "a b- c e f g a-" do
    pattern_generator(16, swing: 30)
  end
end

pattern :drone do
  notes "a" x 12 + "bded"
end

sequence :bassline do
  pattern: :drone
end

# drums

pattern :snap do
  hihat1    = ".--. ..-. ..-. ..--"
  snare     = "...x ...x ...x ..xx"
  bass_drum = "^.^. ^.^. .^.^ ^^^*"  
  cymbal1   = ".... .... .... ...x"
  cymbal2   = cymbal1.gsub(/x/, '-')
  play_together(length: 4.bars, note: :quarter) do
    play hihat, note: 'd-'
    play snare, note: 'd'
    play bass_drum, note: 'c'
    play (rand(1) == 0 ? cymbal1 : cymbal2), note: 'b-'
  end
end

instrument :drums do
  preset 'drums/brooklyn_set'
  pattern :snap
end

sequence :funky_part do
  play_together repeat: 3.times do
    play :bassline
    play :drums
  end
  play :bassline, pattern: :funky
end

sequence :break do
  play sample: 'funky_break', playback: 2.times.faster, length: 4.bars
end

section :intro do
  fade controller: :velocity, range: 60..120, rise: :fast, length: 2.bars do
    play sequence: :bassline
  end
end

section :exit do
  play sample: 'door_closing'
end

song :get_down_on_it do
  play :intro
  play :funky_part
  play :break
  play :funky_part
  play_together do
    play :break
    play :intro, repeat: 2.times
  play :exit
end

# my stuff

def pattern_generator(notes)
  (1..notes).to_a.each do 
    note rand(12) + 20
  end
end