Yamaha DX21 (1) Parameter Change, (2) 1 Voice Bulk Data, (3) 32 Voice Bluk Data

(1) Parameter Change
Status	11110000
ID no.	01000011
Substatus/ch. no.	0001nnnn	n=channel no.
Parameter group no.	00010010
Perameter no.	0ppppppp
Data	0ddddddd
EOX	11110111

This data is transmitted when voice or function parameters are changed in the EDIT or FUNCTION modes. The voice parameters transmitted are those given in voice parameter table 5-2, and the function parameters transmitted are shown in function parameter table 5-3.

(2) 1 Voice Bulk Data
Status		11110000
ID no.		01000011
Substatus/ch. no.		0000nnnn	n=channel no.
Format no.		00000011
Byte	count	00000000
Byte	count	01011101
Data		0ddddddd
			93 bytes
Checksum		0ddddddd
		0eeeeeee
EOX		11110111

The data for one voice is transmitted when a voice selector is pressed in the PLAY SINGLE mode. Data in the voice edit buffer is transmitted when a format no. f=3 dump request is received. The transmitted data is showm in voice parameter table 5-2. The check sum is the lowest 7 bits of the two’s complement sum of all data bytes (the same applies below).

(3) 32 Voice Bluk Data
Status		11110000
ID no.		01000011
Substatus/ch. no.		0000nnnn	n=channel no.
Format no.		00000100
Byte	count	00100000
Byte	count	00000000
Data		0ddddddd
			4096 bytes
		0ddddddd
Checksum		0eeeeeee
EOX		11110111

The data of all 32 voices in RAM memory will be transmitted if the YES (or BULK) key is pressed in response to the “MIDI Transmit?” display which appears when the BULK key is pressed in the FUNCTION mode. The data for all 32 voices will also be transmitted when a format no. f=4 dump request is received. The transmitted data is shown in voice data table 5-1. 55 bytes of 0’s are added to the 73 bytes in this table, so 128 bytes are transmitted for each voice. 4096 bytes are therefore transmitted for all 32 voices.

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