Castalia Communications' posters have been putting answers up on the walls for generations of musicians. Musical Instrument Digital Interface is the electronic digital standard that has revolutionized music. Whether you're playing organ for your church or drumming in a rock band, an understanding of MIDI and how it works is essential for anyone who is serious about today's music. Poster includes: MIDI Note Numbers * MIDI Controller Numbers * Modes * Troubleshooting * Glossary of MIDI Terms * Flow Charts * and more!