MicroMIDI: Custom Events

While MicroMIDI has built-in functions such as transpose to process MIDI input, these functions may not always suit your purpose musically.

In those situations, you can bind your own input events.

Here is an example similar to the one in the last post except that only the notes C, E, and G are transposed

require "micromidi"

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

MIDI.using(@input, @output) do

  thru_except :note

  receive :note do |message|
    message.octave += 1 if %w{C E G}.include?(message.note_name)
    output message
  end

  join

end

For the sake of expressiveness, there are many permutations of each of these methods. I recommend reading the rdoc for the MicroMIDI Instructions classes to get a handle on what's possible.

http://github.com/arirusso/micromidi

Next: Shorthand with MicroMIDI