[Anthony]

My old laptop had the Sigmatel drivers and it had a utility that let you select what each jack was (mid/line in), (line out, spdif, speaker), etc. I believe it was in the control panel or possibly it's own "Program Files" folder.

Good luck.

 

[Anthony]

Yeah, you are good to go there.

Line in and microphone have different sensitivities and I believe different input impedances. Bruce can talk better about that than I can. The line out from the SPL meter or mixing board are better matched with a Line In input on a sound card. The end result is you get more dynamic range measured and better signal to noise. All this ends up as a better measurement in REW.

Good luck.