Hammond SK Pro-73 73-Key Portable Keyboard/Organ - Manual (Page 151)

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MIDI
MIDI CHANNEL
MIDI information travels along MIDI Channels . These channels are similar
to television channels, in that they provide a way to transmit and receive MIDI
information as well as to diff erentiate among MIDI information sent to diff erent
devices. Th
e current MIDI specifi cation provides for 16 Channels, all of which travel
along a single cable.
NOTE: In order for MIDI devices properly to communicate, both the sending and receiving
devices must be set to the same MIDI Channel.
MAIN MIDI MESSAGE
MIDI information is grouped into Channel Messages for each of the 16 MIDI
Channels and a System Message which applies to all Channels.
NOTE: See the MIDI IMPLEMENTATION CHART on page 198 for more details.
CHANNEL MESSAGES
 NOTE ON/NOTE OFF/VELOCITY DATA
Th is data tells: which key (Note Number) is played, at what speed (Velocity) and when
and for how long the note is to sound (Note On/Off ).
 PROGRAM CHANGES
UPPER Keyboard Channel
......................Changes the Combinations of the SK PRO.
External Zone Channels
......................Sends Program Change data to external MIDI equipment.
 CONTROL CHANGES
Control Changes are transmitted and received in response to manipulations of controls
on the Control Panel, connected peripheral devices such as Foot Switches or an
Expression Pedal, or other MIDI controller information.
SYSTEM MESSAGES
 SYSTEM EXCLUSIVE MESSAGES
These are messages which are unique to a particular manufacturer or between
instruments of the same model from the same manufacturer.
Th
e SK PRO can transmit the settings in the instrument’s memory in the form of a
series of System Exclusive (SysEx) messages. Th is is referred to as a Memory Dump.
Doing this allows you to make a backup copy of your settings. If you want to restore
previous settings saved to an external MIDI device, the SK PRO can also receive a
Memory Dump.