[rspencer]

Is it truly acoustic (no PA)? If there's a PA, it won't be hugely different. If not, I'd get as close as possible. Run a good bit more gain on the R-09 than usual. You'll likely not be able to get enough without going really high, and thus getting lots of noise. So, run in 24bits so you can boost in post without adding the noise.

Also, run using mic-in instead of line-in, and you'll get a 8dB boost as well (mic-in runs 8dB hotter than the line-in input).

I can't speak as to the mic gain high versus low, as I've never used it.

Hope that helps.