Pioneer U-05 Operating Instructions Manual page 8

Click on [Start]  [Control Panel]  [Hardware and Sound]  [Sound].
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6 Under the [Playback] tab, confirm that for [Speakers], [Pioneer USB D/A
Converter] is checked as the default device.

If another device has been selected, select [Pioneer USB D/A Converter], and click to [Set
Default].
7 Double click on [Speakers] ([Pioneer USB D/A Converter]), and display its
Properties.
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Procedure continues.
Under the [Levels] tab, set the [Speakers] level to maximum.
If the Speaker Mute indicator (at the left side of the Balance button) is lighted, click it to turn
it off.
Speakers
Confirm that your media player's sound volume is set to Maximum.
In the event your media player requires an output plugin setting, confirm that [Pioneer USB
D/A Converter] is selected.
Procedure finished.