Yamaha MU15 Owner's Manual page 70

Problem
No sound when playing the
MU15 from a computer,
sequencer or external
keyboard.
No sound of a specific Part.
Notes are cut off or omitted.
When using a sequencer or
computer, an unusual "flang-
ing" sound occurs and/or not
all notes seem to sound.
Even though Local Control is
set to "off," the MU15
continues to sound when
playing the built-in keyboard.
70
T r o u b l e s h o o t i n g
Possible Cause and Solution
• Check all MIDI connections, making sure
that the MIDI OUT of the external device
is connected to the MIDI IN of the MU15,
and that the MIDI IN of the external
device is connected to the MIDI OUT of
the MU15. (Page 39.) Or, if you are using
the TO HOST terminal with a computer,
make sure that the terminal is properly
connected to the computer and that the
HOST SELECT switch is properly set for
your particular computer. (Page 37.)
• Check the settings of the connected MIDI
device. If Expression and Master Volume
are set to low values, the MU15 may put
out little or no sound.
• Check the Mute setting. (Page 49.) If a
Part is being muted, it will not sound.
• Check the Variation effect settings. If
Variation Connection (page 60) is set to
"INS" and Variation Type is set to
"NoEffect," the selected Part may not
sound. Also, if Variation Type is set to
"NoEffect" or "Thru" and Dry Level is set
near or at the minimum value, the
selected Part may not sound.
• The maximum polyphony of the MU15
may be exceeded. The MU15 can play no
more than 32 notes at once.
• Check that Local Control is set to "off."
(Page 64.) Also, check the settings on
your sequencer or computer (such as
"MIDI Thru" or "MIDI Echo").
• This is normal, if you've routed the MU15
to a sequencer or computer and that
device's "MIDI Thru" or "MIDI Echo"
option is turned on.