Yamaha MU10 - Manual (Page 18)

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11110000 F0 Exclusive status
01111111 7F Universal Real Time
01111111 7F ID of target device
00000100 04 Sub-ID #1=Device Control Message
00000001 01 Sub-ID #2=Master Volume
0sssssss ss* Volume LSB
0ttttttt tt Volume MSB
11110111 F7 End of Exclusive
11110000 F0 Exclusive status
01111111 7F Universal Real Time
0xxxnnnn xn Device Number, xxx=don't care
00000100 04 Sub-ID #1=Device Control Message
00000001 01 Sub-ID #2=Master Volume
0sssssss ss Volume LSB
0ttttttt tt Volume MSB
11110111 F7 End of Exclusive