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So you do hear the sweep OK? If you go to the Scope tab after a sweep does the captured signal look correct? A screenshot of that may help, worth zooming in on the plot also to make sure it looks correct. What do the Windows mixer settings show for record and replay?
 

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Some of what looks like delay may just be the lack of output at the beginning of the sweep. The first thing to sort out is your mic preamp, which is clipping heavily (hence the flat portion of the captured sweep). You need to back off the mic gain so that it doesn't clip, you may then find the measurement is OK.
 

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The clipping is in the mic input, not the soundcard, hence the lengthy flat portion at the end of the captured trace. The mic preamp is clipping before the soundcard input, so the soundcard levels will never look excessive but the signal is heavily clipped nonetheless.
 
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