I've been asked to help record a choir for the purpose of helping choir and church members master (or at least become familiar with) about three dozen hymns.
My first thought was to record with basically three mics: one cardioid for the Basses and Tenors, one for the Altos and Sopranos, and some appropriate mono mic for Piano or Organ accompaniment. Then, for mix down, I'd print the lower voices plus accompaniment on one channel and the higher voices plus phase reversed accompaniment on the other. In this fashion, one could use the balance control to hear one's section plus comp, one's opposite section plus comp, or just the choir (plus whatever bleed the cardioid mics pick up) if played in mono.
Is that a good way to go? Are there other techniques I haven't thought about?