Read the first 5 MIDI notes presented, play 'em back

crappy_sequencer.rb

require 'unimidi'

input = UniMIDI::Input.use(:first)
output = UniMIDI::Output.use(:first)

puts "-" * 100
puts "Start playing some notes plz"
puts "-" * 100

data = []
NUM_NOTES = 5

loop do
  break if data.size >= NUM_NOTES
  note = input.gets.first

  # only add "note on" data
  data << note if note[:data][0] == 0x90
end

puts "cool, thanks for the notes"

# strip out the other details
notes = data.map { |i| i[:data] }

sequencer = Thread.new do
  Thread.current[:delay] = 0.1
  Thread.current[:notes] ||= []

  loop do
    Thread.current[:notes].each do |note|
      output.puts(0x90, note[1], note[2])
      sleep(Thread.current[:delay])
      output.puts(0x80, note[1], note[2])
    end
  end
end

sequencer[:notes] = notes

gets