Yamaha CLP-154S, CLP-155

●A Brief Introduction to MIDI MIDI, the Musical Instrument Digital Interface, is a world-standard com-

munication 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 Clavinova,

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.

This same type of musical information transfer is used for MIDI se-

quence recording. A sequence recorder can be used to “record” MIDI data

received from a Clavinova, for example. When the recorded data is played

back, the Clavinova automatically “plays” the recorded performance in

precise detail.

The examples given above really only scratch the surface. MIDI can do

much, much more. The CLP-154S/155 offers a number of MIDI functions

that allows 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 feet, since cables

longer than this can pick up noise which can cause data errors.

●MIDI “Messages” Transmitted

& Received by the Clavinova

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 trans-

mitted by the Clavinova whenever a key is pressed, and the Clavinova’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 CLP-154S transmits a MIDI program change number between 0 and 5, and the CLP-155 transmits a

MIDI program change number between 0 and 7 when one of its voice selectors is pressed. This normally causes

the correspondingly numbered voice to be selected on a receiving MIDI device. The Clavinova 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 17 for information on turning program change number reception and

transmission ON or OFF.

Control Change Numbers

Control Change data representing Damper pedal operation is transmitted by the Clavinova 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 Clavinova’s internal tone generator when one of the pedals is used. The Clavinova also receives and

responds to the appropriate control change data. See “Control Change ON/OFF” on page 18 for information on

turning control change number reception and transmission ON or OFF.

The MIDI information (messages) transmitted and received by the

Clavinova are as follows:

Clavinova

MIDI Functions

DOU-10

MIDI Cable

MIDI INMIDI OUT

DOU-10

Data Being Recorded

Playback Data

MIDI IN MIDI INMIDI OUTMIDI OUT