Using the ReSeed Mic Array hardware, configure to allow the multiple voice channels to be recorded.
4 people around a table with the Mic Array in the center of the table. Each person recorded to a different channel or track
3 people singing (all at the same time)
Each person recorded to a different channel or track.
Angular separation might only be 30 degrees.
In all cases the ability to reduce external noise (not from any of the speakers) and to minimize cross talk between the speakers/channels is important.