Asus HDAV1.3 - Xonar Slim Sound Card User Manual page 86

4. Go to the Mixer Recording page and select "Line In" as the recording source.
Click "Reset" to make sure the recording volume is on the default highest
level (0dB). This allows you to get realistic output and input quality ratings for
the Xonar HDAV .3 card.
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You may also choose to use an external 3.5mm line cable as follows (as short
as possible) to connect the Front-Out jack to the Line-In jack for loop-back
testing. In that case, select "Line In" as the recording source on the mixer page.
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ASUS Xonar HDAV .3