MIDI stands for Musical Instrument Digital Interface. It is a
standard designed for electronic musical instruments to communicate
with each other.
MIDI is a set of pre-defined messages that can be sent from one
digital instrument to another to communicate events such as turning on
a note (such as by pressing a key on a keyboard), changing the
instrument that the synthesizer should play, or changing the balance
of the speakers on the synthesizer. MIDI defines 16 channels on which
messages can be sent, so multiple notes and instruments can be played
simultaneously.
MIDI devices have transmitters and receivers. Transmitters are what
MIDI devices use to send messages to another device. Receivers are
what MIDI devices use to receive messages from other devices. Each
MIDI device specifies how many transmitters and receivers it has. In
order to send messages from one device to another, the transmitter of
the first device must send a message to the receiver to the second
device.
For more info on MIDI Routing, see Midi
Routing in AMPT.