Korg EK-50 Owner's Manual page 29

I hear unwanted noise.
… When the volume for a part is raised, the digital signal
processing may overload the signal, which could cause
distortion or other noises. This is not a malfunction.
Try lowering the volume on each part button.
… You may hear distorted or noisy sounds due to input
overload with certain effects. This is not a malfunction.
… In certain electrical environments, you may hear noise due
to a ground loop or other factors.
The pedal switch or expression/volume pedal
connected to the FOOT CONTROLLER jack doesn't work
like it should.
… The functions or polarity for the pedal might not be set
correctly.
See "Pedal Function" (page 22) and "Pedal Polarity"
(page 22) for these settings in the SETTING functions.
… Is the variable range of the expression/volume pedal set
correctly?
Calibrate as shown on "Calibrating an expression/volume
pedal" (page 28).
I cannot record a user song.
… The maximum number of user songs is 999.
You may need to delete one (see page 20 "Deleting a user
song".)
MIDI signals sent to/from this instrument and a
computer are not being correctly received.
… Is the USB cable connected correctly to the USB TO HOST
port?
The instrument does not let me access the MEDIA
functions.
… Is your USB flash drive correctly plugged in?
If the USB flash drive is correctly plugged in, you should see
in the display.
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Appendix