Yellowtec PC Audio Interface User Manual page 5

Settings using Windows XP
Open "Sounds and Audio Devices Properties" (in the "Control Panels" folder).
Select the register card "Volume" and set the control of "Device volume" to "High".
The controller "Device volume" is the master volume control for sound playback.
This controller can also be accessed by selecting the register card "Audio" followed by
a mouse-click on the "Volume" button in the playback range. Though it may be labelled
different there, the controller that can be identified as master volume control is
functionally identical with the one described above.
One more possibility to access the controller is from the Windows "Taskbar".
You can activate this option in the adequate checkbox shown above. If you do so,
please be concerned about the possibility of unintended faulty operation.
Selecting the Checkbox "Mute" will cut sound playback completely.
Note:
The Windows driver for PUC is labelled "USB Audio CODEC". It does not provide
settings for recording level.
PUC itself is referred to as "USB audio device" by Windows.
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set "Device volume" to
"High" (maximum)
click on "Apply"
close the window
by a click on "OK"