Midi Functions; A Brief Introduction To Midi; Midi "Messages" Transmitted & Received By The Ydp-88Ii - Yamaha YDP-88II Owner's Manual

MIDI Functions

A Brief Introduction to MIDI

MIDI OUT
YDP-88II
MIDI, the Musical Instrument Digital Interface, is a world-
standard communication interface that allows MIDI-compatible
musical instruments and equipment to share musical information and
control one another. This makes it possible to create "systems" of
MIDI instruments and equipment that offer far greater versatility and
control than is available with isolated instruments. For example, most
MIDI keyboards (including the YDP-88II, of course) transmit note
and velocity (touch response) information via the MIDI OUT
connector whenever a note is played on the keyboard. If the MIDI
OUT connector is connected to the MIDI IN connector of a second
keyboard (synthesizer, etc.) or a tone generator (essentially a
synthesizer with no keyboard), the second keyboard or tone generator
will respond precisely to notes played on the original transmitting
keyboard. The result is that you can effectively play two instruments
at once, providing thick multi-instrument sounds.
MIDI "Messages" Transmitted & Received by the YDP-88II
The MIDI information (messages) transmitted and received by
the YDP-88II are as follows:
Note and Velocity Data
This information tells the receiving keyboard or tone generator to
play a certain note (specified by the MIDI note number) at a certain
dynamic level (specified by the MIDI velocity value). Note and
velocity data is transmitted by the YDP-88II whenever a key is
pressed, and the YDP-88II's internal AWM tone generator will "play"
the corresponding note(s) whenever note and velocity data is received
from an external MIDI device.
Program Change Numbers
The YDP-88II transmits a MIDI program change number between
0 and 4 when one of its voice selectors is pressed. This normally
causes the correspondingly numbered voice to be selected on a
receiving MIDI device. The YDP-88II will respond in the same way,
automatically selecting the appropriate voice when a MIDI program
change number is received. See "Program Change ON/OFF" on page
15 for information on turning program change number reception and
transmission ON or OFF.
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MIDI Cable
MIDI IN
DOU-10
Data Being Recorded
MIDI OUT MIDI IN
YDP-88II
This same type of musical information transfer is used for MIDI
sequence recording. A sequence recorder can be used to "record"
MIDI data received from a YDP-88II, for example. When the
recorded data is played back, the YDP-88II automatically "plays" the
recorded performance in precise detail.
The examples given above really only scratch the surface. MIDI
can do much, much more. The YDP-88II offers a number of MIDI
functions that allows it to be used in fairly sophisticated MIDI
systems.
• Always use a high-quality MIDI cable to connect MIDI
NOTE
OUT to MIDI IN terminals. Never use MIDI cables
longer than about 15 feet, since cables longer than this
can pick up noise which can cause data errors.
Control Change Numbers
Control Change data representing Damper pedal operation is
transmitted by the YDP-88II whenever one of these pedals is used. If
the receiving device is a tone generator or another keyboard, it will
respond in the same way as the YDP-88II's internal tone generator
when one of the pedals is used. The YDP-88II also receives and
responds to the appropriate control change data. See "Control Change
ON/OFF" on page 15 for information on turning control change
number reception and transmission ON or OFF.
Playback Data
MIDI OUT MIDI IN
DOU-10
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