Hello, I would just like to say hello ! as I am new to this forum... I have been in the past an avid Acoustisoft user. Since I have now lost the program twice on two different laptops !! I will not purchase it again, as Doug at Acoustisoft basically told me to pound sand when asked for an additional key pass... Whatever... done with it. Should have purchased the hard copy !!!! not the download... now that I have purchased all his gear "mic/pre amp". I am looking to use it with REW. Done wasting money on a good product with "NO" customer service or compassion ! I have paid twice with 2 different laptops and here I am again.... Thanks Acousisoft. Anyway, REW seems to have everything I require for measurement and calibration. I now need to get Doug's gear to talk to REW and get the learning curve down to take "accurate" measurements. looking forward to getting into this REW program and see what it has to offer !