Some MIDI messages have only two bytes: a status byte and a data
byte. For exampie,
C3. 05
is a Program Change message on channel 4, telling the receiving device
to switch to program number 6.
MIDI messages with a status byte from FO to FF have no channel
number. They are called System messages,
and are received by all
devices regardless of their channel setting.
For an explanation of each type of message, see the MIDI Format Table
on p.29.
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