Yamaha DD-55 Owner's Manual - Page 22
Channel Messages, System Messages, About MIDI terminals, MIDI IN, MIDI OUT - stand
UPC - 086792826981
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MIDI Functions MIDI is an acronym that stands for Musical Instrument Digital Interface, which allows electronic musical instruments to communicate with each other, by sending and receiving compatible Note, Control Change, Program Change and various other types of MIDI data, or messages. The DD-55 can control a MIDI device by transmitting note related data and various types of controller data. The DD-55 can be controlled by the incoming MIDI messages which automatically determine tone generator mode, select MIDI channels, voices and effects, change parameter values and of course play the voices specified for the various parts. MIDI messages can be divided into two groups: Channel messages and System messages. ● Channel Messages The DD-55 is an electronic instrument that can handle 16 channels. This is usually expressed as "it can play 16 instruments at the same time." Channel messages transmit information such as Note ON/OFF, Program Change, for each of the 16 channels. Message Name Note ON/OFF Program Change Control Change DD-55 Operation/Panel Setting Messages which are generated when the pad or pedal is played. Each message includes a specific note number which corresponds to the pad which is struck, plus a velocity value based on how hard the pad is struck. Voice setting (control change bank select MSB/LSB setting; only receive is available) Voice setting (volume, pan pot, etc.; only receive is available) ● System Messages This is data that is used in common by the entire MIDI system. System messages include messages like Exclusive Messages that transmit data unique to each instrument manufacturer and Realtime Messages that control the MIDI device. Message Name Exclusive Message Realtime Messages DD-55 Operation/Panel Setting Reverb/Chorus/DSP settings, etc. Clock setting Start/stop operation The messages transmitted/received by the DD-55 are shown in the MIDI Implementation Chart on page 41. About MIDI terminals In order to exchange MIDI data between multiple devices, each device must be connected by a MIDI cable. The DD-55 is equipped with two types of MIDI terminals, both of which are located on the right side panel. MIDI IN Data transmitted from other MIDI instruments via MIDI, is received at this terminal. MIDI OUT Data produced by the DD-55, is transmitted to other MIDI instruments via MIDI from this terminal. • Never use MIDI cables longer than about 15 meters. Cables longer than this can pick up noise which can cause data errors. 22