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Troubleshooting
Noise is heard during audio playback
• Is a mic or guitar still connected?
If a mic or guitar is connected to the UA-20, disconnect the mic or guitar, and turn the
input sensitivity knob all the way to the left.
Disconnect any audio devices you are not using.
• Noise is sometimes heard in the line input or mic input.
If a USB-compatible MIDI sound module and the UA-20 are connected via USB to the
same computer, and the outputs of the MIDI sound module are connected to the line
input jacks of the UA-20, noise from your computer may be heard via the MIDI sound
module from the UA-20, depending on the computer you are using. If this occurs, you
can either connect the MIDI sound module and the UA-20 in parallel using a self-
powered hub, or connect the MIDI sound module via its serial or MIDI interface.
• 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.
• Does your sequencer software support ASIO 2.0?
If your ASIO-compatible software does not support ASIO 2.0, it will not operate
correctly if you use [UA-20 ASIO2.0 16bit] or [UA-20 ASIO2.0 24bit] as the ASIO
driver.
In this case, select either [UA-20 ASIO1.0 16bit] or [UA-20 ASIO1.0 24bit] as the ASIO
driver.
• Does your sequencer software support 24-bit audio?
If your ASIO-compatible software does not support 24-bit audio input/output, it will
not operate correctly if you select [UA-20 ASIO1.0 24bit] or [UA-20 ASIO2.0 24bit] as
the ASIO driver. In this case, select either [UA-20 ASIO1.0 16bit] or [UA-20 ASIO2.0
16bit] as the ASIO driver.
• Is the UA-20 connected to a USB hub?
Try connecting the UA-20 directly to the USB connector of the Macintosh itself.