Hi and firstly, I was shocked to note that your querie has gone unanswered for so long. This could be because your question is too difficult to answer, one to which no one knows the answer or, is simply not interesting enough.
I will put my head above the parapet and put the latter as the least probable and from my previous experiences on this forum, most likely to be the two former.
The fact is, you could turn up with a convoy of trucks loaded with expensive recording equipment, to your local church in order to record say, the choir and still not Ďcaptureí the ambience you had hoped for. You will get instead an excellent and faithful reproduction of traffic rumble from up to five miles away, feet scuffling on stone floors and the still resonating echoe of a sermon given last Thursday week. In short, it is almost impossible to record Ďnatural ambienceí and apart from the few well known examples around the world, it is much easier, certainly more practical and infinitely cheaper, not to bother. Barking dogs, car alarms and the hubbub of human activity soon become tiresome, unwanted and can trigger phycotic rages in even the most patient of sound engineers.
And donít fall into the trap of believing that a hall, a church, a theatre or even a field has a unique sound, most often they do not. Whole orchestras cram themselves into recording studios for this very reason. Iím not saying it cannot be done but you have to be very, very lucky indeed to have both the ideal location and conditions to record natural abience.
So why not try an analogue mic thru an effects modeller, of which there are hundreds available, from £20 up to £Thousands. You need to experiment with the echo and reverb to get the sound you want obviously. Go and sit in a church, or a hall and listen to the background noise. Remember, with most sermons in churches and the choir too, they are often actually micíd up and you are listening to crummy cheap speakers placed around the building. You could try recording various venues onto a portable recorder or just onto your mobile phone. Iím sure you could import that recording to your software and listen to it in more detail. Even replicate it using your software, but would it sound like it sounded when you were actually hearing it? I doubt it!
I promise you, as someone who has been recording for thirtytoomany years, for an investment of thirty or forty quid on a vocal effects modeller you can record anywhere you choose without even leaving your home. If the software you are using doesnít achieve this then thatís the downside of (some, not all) digital sound effect processors Iím afraid.
I know initially, you felt you were asking a perfectly simple question to which you would get a perfectly simple answer but sound is never simple and rarely does as it is told. That doesnít mean you didnít deserve an answer, quite the opposite in fact.
Good luck with your project.