Manual Yamaha PDP-300 (page 10 of 17) (English)

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Control Change Numbers

Control Change data representing Soft/Sostenuto and

Damper pedal operations is transmitted by the PDP-300

whenever one of these pedals is used. If the receiving de-

vice is a tone generator or another keyboard, it will re-

spond in the same way as the PDP-300’s internal tone

generator when one of the pedals is used. The PDP-300

also receives and responds to the appropriate control

change data. See “Control Change ON/OFF” on page 9

for information on turning control change number recep-

tion and transmission ON or OFF.

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 cer-

tain instruments or devices connected in series. For ex-

ample, a single MIDI sequencer could be used to “play”

two different instruments or tone generators. One of the

instruments or tone generators could be set to receive

only on channel 1, while the other is set to receive on

channel 2. In this situation the first instrument or tone

generator will respond only to channel-1 information

transmitted by the sequencer, while the second instru-

ment or tone generator will respond only to channel-2 in-

formation. This allows the sequencer to “play” two com-

pletely different parts on the receiving instruments or

tone generators.

In any MIDI control setup, the MIDI channels of the

transmitting and receiving equipment must be matched

for proper data transfer. An “OMNI” receive mode is

also available, which allows reception on all 16 MIDI

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).

Setting the MIDI Channels

1. Press and hold the [MIDI/TRANSPOSE] button.

2. Press the key on the keyboard corresponding to the

desired MIDI transmit or receive channel.*

3. Release the [MIDI/TRANSPOSE] button.

* Keys C1 through D 2 on the keyboard are used to set the

MIDI transmit channel, and keys C3 through D

4 are used to

turn the OMNI mode OFF and set the MIDI receive channel as

shown in the illustration below. The E4 key sets the OMNI

receive mode and basic receive channel 1.

Note: When the power is initially turned ON, MIDI receive is set

to the OMNI mode and the transmit channel is set to 1.

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 “systems” of MIDI instru-

ments and equipment that offer far greater versatility and

control than is available with isolated instruments. For

example, most MIDI keyboards transmit note and veloc-

ity (touch response) information via the MIDI OUT con-

nector whenever a note is played on the keyboard. If the

MIDI OUT connector is connected to the MIDI IN con-

nector of a second keyboard (synthesizer, etc.) or a tone

generator, the second keyboard or tone generator will re-

spond precisely to notes played on the original transmit-

ting keyboard. The result is that you can effectively play

two instruments at once, providing thick multi-instru-

ment sounds.

This same type of musical information transfer is used

for MIDI sequence recording. A sequencer can be used

to “record” MIDI data received from PDP-300, for ex-

ample. When the recorded data is played back, the PDP-

300 automatically “plays” the recorded performance in

precise detail.

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 &

Received by the PDP-300

The MIDI information (messages) transmitted and re-

ceived by the PDP-300 is 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 transmit-

ted by the PDP-300 whenever a key is pressed, and the

PDP-300’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 PDP-300 transmits a MIDI program number be-

tween 0 and 5 when one of its voice selectors is pressed.

This normally causes the correspondingly numbered

voice or program to be selected on a receiving MIDI de-

vice. The PDP-300 will respond in the same way, auto-

matically selecting the appropriate voice when a MIDI

program change number is received. See “Program

Change ON/OFF” on page 9 for information on turning

program change number reception and transmission ON

or OFF.

For setting the receive channel. (C3 ~ D#

For setting the transmit channel. (C1 ~ D#2)

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Yamaha PDP-300 Manual

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