Yamaha MU80 User Manual download pdf (Page 10)

5. Timing distribution

Do not place messages such as Pitch Bend Change and Control Change, etc., in the same time

clock. Since some sequencers rearrange the order of MIDI events that occur in a single time clock,

the results may be unpredictable. Also, dense successions of events (even if they do not occur in

the same time clock) can cause the tempo to be disrupted, or the hardware to respond in

unexpected ways.

*Non-GM1* Regarding Bank Select, the XG Specification says that “As given in the MIDI

specification, MSB + LSB + Program Change must be sent as a unit.” Here, “as a unit” should not

be understood to mean “at the same time,” but rather that “other MIDI events may not occur

between the MSB, LSB and program change.” Hypothetically speaking, if these three messages

were sent at the same time and the sequencer read the Program Change first and the MSB and LSB

later, the voice would be selected from the previously-specified bank. For more information, refer

to XG Specifications #4. Control Changes / Bank Select MSB/LSB.

Note that the reception of Bank Select MSB/LSB does not immediately change the tone generator

voice. The channel stores the received Bank Select MSB/LSB setting, but does not apply it until

receipt of the next Program Change.

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Yamaha MU80 User Manual Page 10