Sorry for the Delay - just seen your post. Hmmmmm where to start. NAT can be a beast to learn but practice makes one familiar with the tools and its limitations. Begin with a preamp preset. Probably the easiest to master and I use it exclusively for all my presets. Make sure your soundcard does not have a hidden buffer. Can cause issues as the sweeps have to sync perfectly for best results. I actually record in Reaper and align everything manually on a sample level. Any specific questions - drop me aline on the Acustica forum. Lots of info there too. Or e-mail me on sales (at) nebulapresets.com .