HP xw4400 Workstation - Manual (Page 33)

Getting Started with Remote Graphics Software
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This brings up another window showing all available controls. The control associated
with the mixer is often called “Wave Out Mix”, “Stereo Mix”, or some variation on
“Mixer”. The Creative Audigy driver calls this the “What U Hear” control. Make sure
this control is enabled similar to the following.
Press the OK button and you should see that the Recording Control window now has
the mixer line as one of the controls. Make sure this item is selected and that the
volume level is not at the bottom. The following picture shows an example of a
selected mixer line.