Yamaha DX21 4-2. SYSTEM INFORMATION, 4-1-2.Channel Mode Message, 4-2-1.System Real-TimeMessage, 4-2-2. System Exclusive Message, (2) Parameter Change

Function s only on MSB data:

	MSB
	00000000	Lowest value
	01000000	Center value
	0 1 1 1 1 1 1 1	Highest value
4-1-2. Channel Mode Message
Status	1011nnnn	n=channel no.
	0ccccccc
	0vvvvvvv
a) Recived whether MIDI CH INFO is ON or OFF
C=123	V=0	All notes OFF
b) Received only when MIDI CH INFO is ON
C=126	V=1	MONO mode ON
C=127	V=0	POLY mode ON

4-2.SYSTEM INFORMATION

4-2-1. System Real-Time Message

Active sensing

Status 1 1 1 1 1 1 1 0

Sensing begins when this code is received once. If status and data are not received within 300 milliseconds the MIDI receive buffer will be cleared and the currently output note will be turned OFF.

4-2-2.System Exclusive Message
( 1 ) parameter Change (swithch mode)
Status	1 1 1 1 0 0 0 0
ID no.	01000011
Substatus/ch. no.	0001nnnn	n=channel no.
Parameter group no.	00001000
Switch no.	0mmmmrnmm
Data	0ddddddd	d=0:OFF, 1~127:ON
EOX	1 1 1 1 0 1 1 1

All panel swithces are controlled. The switch numbers are arranged as shown in the illustration below. Receiced only when MIDI SYS INFO is ON.

(2) Parameter Change

The format is the same as the transmitted parameter change data. Received only when MIDI SYS INFO is ON. Permits changing voice and function parameters while the EDIT mode is active. It is also possible to change modes: PLAY, EDIT, etc. The parameter no. and data received are shown in voice parameter table 5-2 and function parameter table 5-3.

43