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all I read in the REW help files is that "it's not suitable and shouldn't be used."
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hehehe, that should have been the clue for you not to use it.
You've already figured out one of the reasons.... because the mic input will offer too much gain since actual mic signals are quite low in relation to line level signal (such as the SPL meter outputs).
This extra gain at the mic inputs front end usually results in increased noise.
In addition, mic inputs usually enjoy a very limited bandwidth that is designed to comply with a narrow voice frequency range that a cheap microphone would supply.
Most members that use laptops for REW purchase an external USB soundcard. They are quite inexpensive and offer line-in and line-out suitable for REW.
brucek