I don't have the BR-1180 but I do have a BR-8 so for recording is the same technique. Using the "SIMU" mode, having two mic plugged in, use the "Time/Value" and select "By-pass effect". Doing this turns off any effect that 1180 tries to apply for voice & guitar in SIMU mode.
Here you have a choice of using two mics in 'x' pattern for stereo recording (do a search for this because you need to get the angle of the mics). I than panned the mic inputs for a natural sound.
What I did first was record all the parts of my song(s), bass, guitar(s) parts, with a drum machine. I than recorded my drummer, he used the 'e' drums as a click track. I recorded him on a pair of "V-tracks", after I was happy with the results, I erased the 'e' drums and bounced the bass & drums as a stereo pair.
The BR-1180, like the BR-8 was designed for the bedroom musician not really for 'live' recording but with creative mic'ing you can record live. We (my band) ended up buying a used VS-880EX so we could have more inputs. I brought my BR-8 just to make song demos.
