HP Remote Graphics 4.2.0 User's Guide
Press the Volume button in the Sound recording section in the middle of this window.
This brings up the Recording Control window. Many audio device drivers do not show
all available inputs by default. The mixer line is often one of the control lines that are
not visible by default. To make it visible, click on the Options item in the menu and
then click on the Properties item as shown in the following picture.
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