William Fleming

Yes, there are a lot of plugins that do a great job reducing noise, but still use resources to do the job. Although you can Freeze the track, I was thinking more along the lines of what other audio editors do, that actually modify the wave form and not have to use any CPU power after it is processed. It would be like Time Stretching, cut and pasting, Normalizing or any of the other wave editing Sonar already performs. And of course, still be nondestructive to reverse the process if needed.

Don't know if it's been brought up, but it would be nice to have a "Noise Reduction" add to the audio editor. Like the ones that sample a small section of noise and then rids the noise though out the whole wav file.

Select the point where you want the song to end. Split the track at that point (right click on track and select "split"). Delete everything AFTER the split point.