INTRODUCTION TO MIDI
MIDI (Musical Instrumentation Digital Interface) is the communication specication dened by the
world's musical instrument manufacturers to allow one electronic device to talk to another. The speci-
cation was initially intended to allow keyboards to communicate with other keyboards and computers,
and thus, the specication includes codes to represent note on, note o, volume dynamics, pitch bend,
patch change, etc. In fact, an examination of the controls of a synthesizer gives a good indication of the
types of commands that the MIDI specication covers — anything that you can control in the synth can
also be controlled through the use of MIDI.
A portion of the MIDI specication deals exclusively with music generation, i.e. note on, note o, pitch
bend, and other commands, the rest of the MIDI specication provides a means to control the function
of electronic hardware. The MIDI program and control change commands oer a wide range of possibil-
ities for controlling patch bays, internal routing of signals in mixers, eects units, and many other digi-
tally accessed audio related equipment. The ability of the PDS-3500, THE MIDI PEDAL, to store in
memory up to 1,984 dierent presets and transmit these MIDI control codes to various pieces of equip-
ment makes it a very powerful tool for the performing musician and MIDI studio.