Yamaha MU80 Owner's Manual page 26

GUIDED TOUR
Operation
Play some notes on your MIDI keyboard.
the "level meter" bars in the display should move — and you
should be able to hear the sound of the MU80 as you play.
NOTE
If your MIDI keyboard is transmitting on channel 1, the Voice of Part 1 should sound. If it is
transmitting on another channel, another Part's Voice will sound. For the sake of these intro-
ductory instructions, set your keyboard so that it transmits on channel 1. (Refer to the own-
er's manual of that instrument if necessary.)
1 6
If you've carefully followed all instructions up to now, one of
The "level meter" bar indicates the "level" (velocity) of the
incoming MIDI data.
The number under the moving "level meter" indicates the Part number.