Yep, I'm with shoestring on this one. That's what a lot of my projects look like as well. Been using PE for a while now and it beats the hell out of manually syncing - especially when shooting multicam with DSLRs and the like where you have a 30-minute limit. I've found it best to use the 'Try really hard' option, and I'd say it nails it probably 90-95% of the time (has a harder time when the camera audio is really loud/distorted).