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What is MIDI? Data Types • Sequencers use two types of data: • Audio: sound from the real world • MIDI: control data used to trigger sound devices M.I.D.I. • Musical Instrument Digital Interface • Industry standard protocol • Allows electronic musical devices from different manufacturers to communicate A MIDI Sequencer Electronic Instrument with MIDI input Sound MIDI data Electronic Instrument with MIDI input MIDI data MIDI Sequencer Sound MIDI data Electronic Instrument with MIDI input Sound Fig .1 A MIDI sequencer instructing electronic instruments. A MIDI Keyboard MIDI Keyboard MIDI data Computer V.I. host Virtual Instrument Sound Fig .2 A MIDI keyboard triggering a virtual instrument. MIDI Can be Used • To control several different parameters on several different channels at once • To switch patches on guitar pedals • To synchronise the BPMs of devices: • e.g. a record deck to a drum machine Pros & Cons of MIDI in Composition • Can create really complex music • MIDI control data can be precisely edited which removes the need for: • skilful playing • re-recording • Editing MIDI can become very time consuming MIDI Messages • Note On command: • a channel number 1-16 • a pitch (e.g. middle C = 60) • a velocity (loudness) • Note Off command: • channel number, pitch, release velocity MIDI Note Numbers 58 61 63 66 68 70 73 59 60 62 64 65 67 69 71 72 MIDI CCs • MIDI Continuous Controllers • further MIDI messages that affect notes • e.g. aftertouch • parameter control • e.g. filter cut off MIDI CCs • Filter cut off assigned to controller 18 • Slider value 1-127 is transmitted along with “18” • MIDI CCs are sometimes pre-assigned to particular functions on a synth • MIDI CCs can also often be assigned using MIDI learn Equipment • MIDI/Audio Interface (M-Audio FT Ultra) • Microphones • condensor (AKG C3000 B) • dynamic (Shure SM57) • Other devices: • Tenori-on • Kaos Pad 3