Yamaha MU5 Owner's Manual page 67

4.3 Universal Non Real Time Message
4.3.1 General MIDI Mode On
11110000 F0
01111110 7E
01111111 7F
00001001 09
00000001 01
11110111 F7
or
11110000 F0
01111110 7E
0xxxnnnn XN
00001001 09
00000001 01
11110111 F7
Following reception of the above parameters, all MU5 parameters will be initialized
(excepting Master Tuning). However, when Mute Lock of the System parameters is
set to on, Receive Note Message of the Multi Part parameters is not initialized. Since
one of these messages takes about 50 msec to process, allow a sufficient amount of
time before transmitting the next message.
add-
16
= Exclusive status
= Universal non-real time
= ID of target device
= Sub-ID #1=General MIDI Message
= Sub-ID #2=General MIDI On
= End of exclusive
= Exclusive status
= Universal non-real time
= Device Number, xxx = Not used
= Sub-ID #1=General MIDI message
= Sub-ID #2=General MIDI on
= End of exclusive