That is the solution so I will mark it is a such.
But an another important part would be to know if mixing down prior to output (e.g., within MetaSounds) reduces the number of channels you actually use.
The thought I had is, that if I had, say a common instance of a metasound handling a large number of sounds for a specific application (e.g., gunshot sounds), would the fact that they would all be mixed into one two channel output, reduce the channel footprint, or would the fact that I am using numerous wavs to produce that output defeat that approach?