Yamaha YPP-50 Manual do Proprietário - Página 12

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MIDI FUNCTIONS

A Brief Introduction to MIDI

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 "sys-

tems" 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 Personal

Electronic Piano, 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 such as the Yamaha

EMT-1 FM Sound Box (essentially a synthesizer with no key-

board), 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.

This same type of musical information transfer is used for

MIDI sequence recording. A sequence recorder such as the

Yamaha EMQ-1 Memory Box can be used to "record" MIDI

data received from a Personal Electronic Piano, for example.

When the recorded data is played back, the Personal Electronic

Piano automatically "plays" the recorded performance in precise

detail.

The examples given above really only scratch the surface. MIDI

can do much, much more. The YPP-50 offers a number of

MIDI functions that allow it to be used in fairly sophisticated

MIDI systems.

Note: Always use a high-quality MIDI cable to connect MIDI OUT

to MIDI IN terminals. Never use MIDI cables longer than

about 15 meters, since cables longer than this can pick up

noise which can cause data errors.

MIDI "Messages" Transmitted & Receiv-

ed by the Personal Electronic Piano ___

The MIDI information (messages) transmitted and received by

the YPP-50 Personal Electronic Piano 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 Personal Electronic

Piano whenever a key is pressed, and the Personal Electronic

Piano's internal AWM tone generator will "play" the cor-

responding note(s) whenever note and velocity data is received

from an external MID1 device.

Program Change Numbers

The YPP-50 transmits a MIDI program number between 0 and

14 when one of its voice selectors is pressed. This normally

causes the correspondingly numbered voice or program to be

selected on a receiving MIDI device. The Personal Electronic

Piano 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 11 for

information on turning program change number reception and

transmission ON or OFF.

NO.

VOICE

PIANO

E.PIANO

HARPSI

VIBES

BRASS

STRINGS

P.ORGAN

BASS

Control Change Numbers

Control Change data representing damper pedal operations is

transmitted by the Personal Electronic Piano whenever the pedal

is used. If the receiving device is a tone generator or another

keyboard, it will respond in the same way as the Personal

Electronic Piano's internal tone generator when these controls

are used. The Personal Electronic Piano also receives and

responds to these as well as some additional control change

data described in the "MIDI DATA FORMAT" section of

this manual. See "Control Change ON/OFF" on page 11 for

information on turning control change number reception and

transmission ON or OFF.

Note: None of the YPP-50 MIDI functions can be engaged while the

built-in metronome is running.

MIDI Transmit & Receive Channel

Selection

The MIDI system allows transmission and reception of MIDI

data on 16 different channels. Multiple channels have been

implemented to allow selective control of certain instruments

or devices connected in series. For example, a single MIDI

sequence recorder could be used to "play" two different instru-

ments or tone generators. One of the instruments or tone genera-

tors could be set to receive only on channel 1, while the other

is set to receive on channel 2. In this situation the first instru-

ment or tone generator will respond only to channel-l infor-

mation transmitted by the sequence recorder, while the second

instrument or tone generator will respond only to channel-2

information. This allows the sequence recorder to "play" two

completely different parts on the receiving instruments or tone

generators.

In any MIDI control setup, the MIDI channels of the trans-

mitting and receiving equipment must be matched for proper

data transfer. An "OMNI" receive mode is also available,

which allows reception on all 16 MlDI channels. In the OMNI

mode it is not necessary to match the receive channel of the

receiving device to the the transmit channel of the transmitting

device (except when receiving mode messages).

VOICE

NO.

PIANO + BASS

E.PIANO + BASS

HARPSI + BASS

VIBES + BASS

BRASS + BASS

STRINGS + BASS

P.ORGAN + BASS

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