OK, I did this as well as I knew how last year, but I'm going to do it again, and I want to do it better. Here's the deal- I'm recording a 60 voice choir with some high octane voices in a circus tent within 30 feet of a dirt road with trucks loaded with noisy exhausted athletes occasionally blasting AC/DC and within 100 yards of an Interstate highway! It's a lot like a carnival, and yes, you have crowds walking on the dirt road. Of course, there are also freelance noisemakers, such as the blacksmith across the road pounding dents out of armor. I think the choir director gave him a few new ones! The good news is- the choir has enough balls to drown out almost all ambient noise, except during solos. So- of course, you have an unavoidable noise floor at the beginning and end of pieces.
You can cut it off, but that's abrupt, you can just ignore it, and if you have 3-5 sec. of silence between songs, that's also abrupt. Would you try to do quick fades? and if so, about how many seconds would you use for the fade.? If you have a better idea, lay it on me.
The other good news is it's a dress rehearsal, so we can re-start after the AC/DC, and I had to punch in a few times to avoid heavy duty ambient noise assaults (air horn on big rig- ooh baby!). If anyone wants to know, I'm using minimalist gear (have to) - Just a Zoom H4n, 2 AKG C2000B's in NOS, and a heavy duty boom.