This is a Ruby gem to facilitate controlling MIDI devices using the MIDI Machine Control protocol.

• Implements the common MMC commands, including transport (stop, play, record, etc.) and track arming.

• Does not handle any command responses, whether status (like timecode) or errors.
• Does not implement full MMC specification.

require 'midi-mmc'
require 'unimidi'

# set up
midi_output = UniMIDI::Output.gets
mmc = MIDI::MMC.new(output: midi_output)
mmc.reset

# record
mmc.goto_zero
mmc.arm_tracks(1)
# record something here
mmc.stop
mmc.arm_tracks(nil)

# play back
mmc.goto_zero
mmc.play

Install as a gem:

gem install midi-mmc

...or add to your Gemfile or .gemspec file as needed.

MIDI::MMC is designed to work with the UniMIDI gem, although any object passed in the output parameter to MIDI::MMC.new that responds to the #puts method can be used.

• Complete MIDI 1.0 Detailed Specification (1996, from archive.org)
• MIDI Machine Control (Wikipedia)