About MIDI.
TIP.
MIDI performance data and commands are transferred in the form of numeric values.
TIP.
Since MIDI data that can be transmitted or received varies depending on the type of MIDI device, check the "MIDI Implementation Chart" to find out what MIDI data and commands your devices can transmit or receive. The YDP-123's MIDI Implementation Chart appears on page 38.

MIDI (Musical Instrument Digital Interface) is a standard format for data transmission and reception. It enables the transfer of performance data and commands between MIDI devices and personal computers.
Using MIDI, you can control a connected MIDI device from the YDP-123, or control the YDP-123 from a connected MIDI device or computer.

MIDI connectors.
(Figure)
MIDI [IN]: 	Receives MIDI data.
MIDI [OUT]: 	Transmits MIDI data.
MIDI [THRU]: 	Transmits data received at the MIDI [IN] connector, passing it through the unit unmodified.

MIDI cables.
Prepare dedicated MIDI cables.
TIP.
You can also obtain detailed information about MIDI from various music books and other publications.


Connecting a Personal Computer.
You can enjoy computer music data on the YDP-123 by connecting a computer to the MIDI jack.

NOTE.	When the YDP-123 is used as a tone module, performance data with voices that are not found on the YDP-123 will not be played correctly. 
	
"The Clavinova-Computer Connection," is a supplementary guidebook that describes, for beginners, what you can do with your YDP-123 and a personal computer and how to set up a YDP-123-Computer system (although the guidebook only mentions the Clavinova, it applies equally to the YDP-123 digital piano). The document is available as a PDF file (in English) at the following Internet address:
Clavinova Web site (English only):
http://www.yamahaclavinova.com/
Yamaha Manual Library:
http://www2.yamaha.co.jp/manual/english/

There are two methods by which to connect the YDP-123 to a personal computer:
1. Use a MIDI interface and the YDP-123's MIDI connectors (page 25).
2. Use the USB port on the computer and a USB interface (model UX16, UX96, or UX256) (page 25).

NOTE	Before you connect the YDP-123 to a personal computer, first turn off the power to both the YDP-123 and the computer. After you make the connections, turn on the power to the computer first, then turn on the power to the YDP-123.
	
1.	Using a MIDI interface and the YDP-123's MIDI connectors
Connection
Use a MIDI interface to connect a computer to the YDP-123 using special MIDI cables.
(Figure)

2.	Connecting the computer's USB port to the YDP-123 via a USB interface, such as the UX16,UX96, or  UX256.
Connect the computer's USB port to the USB interface (such as the UX16, UX96, or UX256) using a USB cable. Install the driver (that came with the USB interface) on the computer, and connect the USB interface to the YDP-123 using a serial cable or MIDI cables.
For more information, refer to the instruction manual for the USB interface.

An example of connecting the USB interface to the YDP-123 using MIDI cables.
(Figure)



MIDI Functions.
You can make detailed adjustments to MIDI settings.
For more information about MIDI, see the "About MIDI" section (page 23).

MIDI Transmit/Receive Channel Selection.
In any MIDI control setup, the MIDI channels of the transmitting and receiving equipment must be matched for proper data transfer.
This parameter enables you to specify the channel on which the YDP-123 transmits or receives MIDI data. 

NOTE.
Demo and preset song data are not transmitted via MIDI.
NOTE.
In Dual mode, Voice 1 data is transmitted on its specified channel and Voice 2 data is transmitted on the next greater channel number relative to the specified channel. In this mode, no data is transmitted if the transmit channel is set to "OFF."

TIP.
ALL:
A "Multi-timbre" Receive mode is available. It allows simultaneous reception of different parts on all 16 MIDI channels, enabling the YDP-123 to play multi-channel song data received from a music computer or sequencer.
1 plus 2:
A "1+2" Receive mode is available. It allows simultaneous reception on channels 1 and 2 only, enabling the YDP-123 to play 1 and 2 channel song data received from a music computer or sequencer.
TIP.
Program change and other like channel messages received will not affect the YDP-123's panel settings or the notes you play on the keyboard.

NOTE.
The YDP-123 does not receive MIDI data when it is in Demo or Preset Song mode.

Procedure.
Setting the transmit channel
While holding down the A minus 1 and C sharp 0 keys, press one of the C1 to E2 keys.
Setting the receive channel
While holding down the A minus 1 and C sharp 0 keys, press one of the C4 to F5 keys.
(Figure)

Local Control ON/OFF.
"Local Control" refers to the fact that, normally, the YDP-123 keyboard controls its internal tone generator, allowing the internal voices to be played directly from the keyboard. This situation is "Local Control On," since the internal tone generator is controlled locally by its own keyboard.
Local control can be turned OFF, however, so that the YDP-123 keyboard does not play the internal voices, but the appropriate MIDI information is still transmitted via the MIDI OUT connector when notes are played on the keyboard. At the same time, the internal tone generator responds to MIDI information received via the MIDI IN connector.

Procedure.
While holding down the A minus 1 and C sharp 0 keys, press the C6 key.


Program Change ON/OFF.
Normally the YDP-123 will respond to MIDI program change numbers received from an external keyboard or other MIDI device, causing the correspondingly-numbered voice to be selected on the corresponding channel (the keyboard voice does not change). The YDP-123 will normally also send a MIDI program change number whenever one of its voices is selected, causing the correspondingly-numbered voice or program to be selected on the external MIDI device if the device is set up to receive and respond to MIDI program change numbers.
This function makes it possible to cancel program change number reception and transmission so that voices can be selected on the YDP-123 without affecting the external MIDI device.

TIP.
For information on program change numbers for each of the YDP-123's voices, refer to page 34 in the MIDI Data Format section.

Procedure.
While holding down the A minus 1 and C sharp 0 keys, press the C sharp 6 key.


Control Change ON/OFF.
Normally the YDP-123 will respond to MIDI control change data received from an external MIDI device or keyboard, causing the voice on the corresponding channel to be affected by pedal and other "control" settings received from the controlling device (the keyboard voice is not affected). The YDP-123 also transmits MIDI control change information when the pedal or other appropriate controls are operated.
This function makes it possible to cancel control change data reception and transmission so that, for example, the YDP-123's pedal and other controls can be operated without affecting an external MIDI device.

TIP.
For information on control changes that can be used with the YDP-123, refer to the MIDI Data Format on page 34.

Procedure.
While holding down the A minus 1 and C sharp 0 keys, press the D6 key.

This is the end of the file.