Kurzweil Flash Play PC4 Musician's Manual page 325

Troubleshooting
Common Problems
If you can hear sound but it is low or distorted, check if one of the following might be the
issue:
ISSUE
REMEDY
ISSUE
REMEDY
ISSUE
REMEDY
ISSUE
REMEDY
10-4
A received MIDI volume message has specified a low
volume.
Set the volume of the audio system or mixer to the lowest level.
Disconnect all MIDI cables, set the "Destination" parameter in
Global Mode (MIDI page) to LOCAL or USB+MIDI+LOCAL and
reset the volume level on the PC4, by pressing Panic (see
1-16). Finally, slowly turn up the volume level of the audio
on page
system or mixer.
The current Multi has another controller assigned to volume,
and it is turned down.
Select a different Multi. Or change the problematic controller
setting by editing the Multi in Multi Edit Mode.
The audio system input is set for low impedance instead of
high impedance.
Set the volume of the audio system or mixer to the lowest level,
change the impedance setting, and then slowly turn up the
volume of the audio system or mixer.
The input trim to the audio system or mixer is set too low.
Slowly turn up the trim.
Panic