In ep 114, how NOT to attend a trade show,
my man in Hollywood gets back to us on track laying for motion picture,
and JR asked about the best way to record some character interviews outside of the ideal studio environment.
A couple of links for you:
FMR Audio (makers of the RNC compressor)
The Wiki article on dBm,
the Wiki article on decibels,
the Wiki article on Dolby Surround (including info on LtRt), and
the Wiki article on downmixing (which also includes info on LtRt).