I need to convert a lot of FLAC files of different rates and bit depths to WMA for a system that supports up to 48k/24 (Mercedes Burmester audio).
I obviously want to leave my CD content as is.
A few 44/24 files I want to leave as is.
Higher resolution content I want to convert to 48/24.

Is there a setting that will do that? Down-convert to 48/24 as required, but never up-convert?