I've never attempted to record a choir of any size. All of my experience is in the studio with no more than 3 vocalists. Where would you place mics for a choir of 30-50 pre-teens. I've been asked to record a Christmas CD for a Junior Highschool Choir. BTW, I don't know what "ORTF" means. I keep coming accross it while reading other posts. Please be as elementary as possible when responding. Thanks in advance for the help.