Hauppauge WinTV USB - Manual (Page 13)

application is started by clicking either:
Start/Programs/Accessories/Multimedia/VolumeControl
or
Start/Programs/Accessories/Entertainment/VolumeControl
or
Double click the speaker icon in System tray (found normally in the lower
right hand corner of your computer screen).
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 Balance. 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 Line-In 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 (in WinTV200 click
on the AUD button), 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