Yamaha MU128 Owner's Manual page 40

Selecting and Playing Individual Voices
5 Select the desired Performance.
Use the [SELECT </>] buttons to select the Program Number
parameter, then use the [VALUE -/+] buttons or data dial to
select the desired Performance number.
6 Play the connected MIDI keyboard.
Make sure that your keyboard is transmitting over MIDI channel
1. (Refer to the owner's manual of that instrument if necessary.)
If you've carefully followed all instructions up to now, the "level
meter" bars in the display should move — and you should be
able to hear the sound of the MU128 as you play.
Go on to select other Performances in the same bank and play those
as well. To try out Performances in the other bank, return to step #4
above.
40
Performance number
The "level meter" bars indicate the "level" (velocity) of the incom-
ing MIDI data.
MU128 Guided Tour