I use Cakewalk Pro Audio 9 so it may be similar, select "TOOLS" and then "MIX DOWN AUDIO". Select an empty track, it will combine all of your audio tracks into 1 track. (1 track in Sonar but actually a track stereo mix.) At this stage I usually save the project, delete everything but the resulting track. Save this as a "final mix" version. NOW you may plug in your effects, compressors, eq, etc, play with it until you like it. Save it, export as wave or mp3 and you're on your way! Should be a piece of cake(walk).. oohh..ugly pun...