Yamaha MU80 Owner's Manual page 104

Distortion can be
applied to only one
Part at a time.
distortion part
dry level
rev send
DIST
part A1
distotion on/off
cho send
var send
dry level
DIST rev send
part A2
distotion on/off
cho send
var send
dry level
DIST rev send
part 1
distotion on/off
cho send
var send
dry level
DIST rev send
part 32
distotion on/off
cho send
var send
VARIATION CONNECTION = SYSTEM
REVERB
send chorus to reverb
CHORUS
send variation to chorus
send variation to reverb
VARIATION
DRY LINE
Thick line indicates stereo signal.
reverb return reverb pan
PAN
chorus return chorus pan
PAN
EQ
variation return variation pan
PAN
OUT