Instruction Manual

48 Introduction
Computers, Sound, and Music
Computers, Sound, and Music
This section provides some background on the different ways that
computers store and play sound and music. Computers work with sound
and music in two different forms: MIDI and digital audio.
Next topic: MIDI.
MIDI
MIDI (short for Musical Instrument Digital Interface) is the way computers
communicate with most sound cards, keyboards, and other electronic
instruments. MIDI refers to both the type of cables and plugs used to
connect the computers and instruments, and to the language those
computers and instruments use to talk to each other. The MIDI standard is
accepted and used worldwide. Almost any electronic instrument you buy
today will have MIDI connectors and can be used with other MIDI
instruments and with your computer’s MIDI interface. To record MIDI in
SONAR, you have to have a MIDI cable connecting the MIDI OUT port on
your MIDI instrument to a MIDI IN port on either your sound card or your
MIDI interface. You must also make sure that you have installed the
software MIDI driver that came with your sound card or MIDI interface.
The MIDI language conveys information and instructions, both from the
computer to the instrument and from the instrument to the computer. For
example, if your computer wants your keyboard to play a note, it sends a
MIDI “Note On” message and tells the keyboard which note to play. When
your computer wants the keyboard to stop playing that note, it sends
another message that stops the note from playing.
The MIDI language has many other instructions, such as messages to
change the sound that is used to play the notes (the bank and patch),
messages that enable working with the sustain pedal and the pitch-bend
wheel, and others. By sending the right messages at the right times, your
computer can control your electronic instrument and make it play music.
MIDI information can be sent on 16 different channels. You can set up your
MIDI equipment to listen for messages on all channels or on only a few.
MIDI files contain all the MIDI messages and timing information that are
needed to play a song. MIDI files can be read and played by many different
programs, including SONAR, and can even be played by programs on other
types of computers. MIDI files have the extension .
MID.
There are several important advantages of the MIDI format:
• Large amounts of music can be stored in a very compact form