Edirol UA-20 Owner's Manual page 64

Appendices
Noise or distortion occurs when the UA-20 is
not connected to your computer/The sound is
too weak
Has a mic or guitar been left connected?
If a mic or guitar is connected to the UA-20, disconnect the mic or guitar and turn the
input volume knob all the way toward the left (lowering the input level).
Have you connected the grounding terminal?
Connecting the chassis of your computer or the grounding terminal of your computer's
AC power cord to an electrical ground may solve the problem. Also, make sure that a
device that produces a strong magnetic field, such as a television or microwave oven, is
not located nearby.
Could numerous audio devices be connected?
Noise may occur if numerous audio devices are connected. Do not connect audio
devices you are not using.
Are two or more audio devices such as the UA-20 or a mixer connected to your
computer?
Try connecting only a single UA-20 unit, and check whether the noise disappears. If
numerous audio devices are connected to a computer, noise may occur depending on
your system. In such cases, connect only the UA-20 to your computer.
Volume from a device connected to the input jacks is too
low
Are you using a cable that has a built-in resistor?
Use a cable without a built-in resistor (e.g., Roland PCS series).
Is the Input volume raised appropriately?
Turn the knob clockwise to adjust the volume.
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