Easy acid in 40 lines or less

simple_acid.rb

use_synth :tb303
cut = 0
define :acid do
  n = (ring :e1, :e2, :e3).tick
  play n, release: 0.125, cutoff: cut, res: 0.8, wave: 0
  puts cut
  sleep 0.125
end
define :acid2 do
  for cut in (111).downto(0) do
      acid
    end
  end
  define :drums do
    in_thread do
      64.times do |b|
        sample :bd_fat, amp: 20
        16.times do
          puts b
        end
        sleep 0.50
      end
    end
  end
  for cut in (range 1, 111) do
      acid
      if cut == 110 then
        128.times do |a|
          acid
          if a == 8 then
            drums
          end
        end
        acid2
      end
    end