Asus xonar dsx User Manual page 39

The following message appears when Mic Echo is selected:
Select a recording source from the list. With Mic, you will only record
audio source from microphone with echo effects; but you are able to
record all audio sources from Wave, Aux, and Mic with microphone
echo effect. Click OK to accept or Cancel if you want to enable the
setting later. Select Don't remind me again to prevent the message
from being displayed again.
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ASUS Xonar DSX