Originally Posted by Nukes
Currently i am thinking of using a spaced pair on the female choir (TLM 193's, with an option of using the Binural's as an ambient at the back of the hall),
It's not clear from your post how you would get four mic inputs with your duet but that would probably work well. (I guess you would use the Zoom recorder - I read a review that made 4 tracks sound like a pain)
To make it simple I would probably just use the TLM 193's as a spaced pair for all three recordings. If you have a stereo bar you could try ORTF.
If you stick with a spaced pair or ORTF when the concert is over your done other then assembling the CD. The Duet doesn't do m/s on input so you'll have to do it afterwards. You didn't say what program you use on your laptop. Digital Performer has a plugin that does the m/s matrix but you'd still have to run a mix. Not sure about other programs so you might have to copy the 414 track, flip the phase and mix. It's your time.