Btw, did you already think about a "Mix Down" Feature for the Synchron Player?
So you once choose your mix (from all positions als desired) then click the Mix-Down Button and "new" physical files are created with exactly this Mix.
I assume this feature could be handled very similar to VI-Pros time stretch functionality, and would not only allow to safe some memory/CPU, but in addition also SSD Space (having 5 MIC positions on slow hard disk and only the "Mix-Down" position on SSD.
Anyhow this does not need to be a "day one" feature :)