Hauppauge WinTV USB - Manual (Page 15)

The VolumeControl application is started by clicking either:
Start/Programs/Accessories/Multimedia/VolumeControl
or
Start/Programs/Accessories/Entertainment/VolumeControl
or
Double click the speaker icon in Systray
You should see Line-In balance as one of the selections. If not, then click on
Options/Properties and under Show the following volume controls check
Line-In. Then click OK.
You should now see a selection for Line-In. Make sure the Select box is
checked, then raise the volume to about 1/2 of the way to the top. This should be a
good starting point for the volume control.
If LineIn is muted or not selected, unmute or select it to hear audio from the
WinTV USB.
In the WinTV application under the Configure/Audio menu, the Mixer ID
should be set at Line-In.
As you adjust the audio volume in the application, you should see the slide bar in
the Volume Control window rise and fall.
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WinTV-USB Installation and Reference Manual