gistfile1.rb

require 'rubygems'
require 'midiator'
include MIDIator::Notes

# don't ask, just be a good sheep..
# http://www.ruby-forum.com/topic/123503
Kernel::require "serialport.so" 

#params for serial port
port_str = "/dev/tty.usbserial-A6006eSL"  #may be different for you
baud_rate = 9600
data_bits = 8
stop_bits = 1
parity = SerialPort::NONE
sp = SerialPort.new(port_str, baud_rate, data_bits, stop_bits, parity)

midi = MIDIator::Interface.new
midi.autodetect_driver


puts "begin"
begin
  while true
    resp = sp.getc
    puts "Got MIDI note: #{resp}"
    midi.play resp
  end
ensure
  puts "cleaning up!"
  sp.close
end