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Try this:
  • Back up to the original version of the exported impulse before changing the windowing
  • export it
  • pull it up in Audacity
  • trim everything from before the first movement of the impulse
  • trim enough off the tail end to make it short enough to fit
  • be sure you save it in the right format
It should work fine.
 

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I apologize, I am new to REW and Audacity. Let me guess ..
1. It might be obvious, but I am a bit confused with first two steps. What is the need to get the exported file twice (export after backup of exported file)?
2. "pull it up in Audacity" means Impart as raw data from text file (should I remove the header?)

3. I tried to Import the exported (1st time) IR file as raw data into Audacity, but what I got in Audacity did not look like Impulse Response.

I do not mind reading docs and helps, but after 3 days of research I found just bits an pieces, and things do not connect to each other. Sorry, freshman complaints :)

Thanks for you help,
Alex
Beg pardon, I was perhaps a bit brief and not terribly clear.
  1. Use the standard windowing settings in REW
  2. export the impulse file from REW as a .wav file, whatever its length
  3. use Audacity, a waveform editor, to import that .wav file for editing
  4. In Audacity, trim the extra time from before the beginning of the impulse; find the point where it first starts to move from zero, probably a few (5?, 10?) mS before the peak of the impulse
  5. Still in Audacity, trim the extra time from after the end of the impulse to make the overall impulse length fit the convolution device it will be used with; if the tail is still going up and down a little, trim it at a zero crossing point, where the waveform is crossing through the zero level
  6. be sure you save from Audacity in the right format, as a .wav file
 
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