Then open Sonar, and import each seprate wav, to a seprate track. You'll get a seprate wav file per track, and a 'master' wav, which will contain the entire mix (I usally delete that one). Once you've done that, click the button to render to wav file, and be sure you tick the light to 'split mixer tracks'. Best thing to do (IMO), is make your music in FLS (since it is sooooooo much easier to work with, and the piano roll has more options), then, add each channel to a mixer track, in FLS's mixer. I have used it once or twice as a dxi in Sonar 5 and 6 PE, but not really to any extent. I have FL Studio 6.0.8 XXL Producer Ed right now.