Maybe I'm a bit off topic.
But I tried to do some bach processing using Twistedwave and Harpex-x vst plugin.
The recordings I used were made with an Ambeo microphone and were four channels interleaved wave files.
I set up Harpex-x input mode to "Ambeo" and output mode to "Surround" and preset to "L C R Ls Rs LFE" but after the processing twistedwawe output is a four-channels file instead of a six-channels file that is what I was expecting. It seems like it's doing the transcoding but without changing the number of outputs during Harpex-x processing.
I read both Harpex-x and Twistedwave manuals but I couldn't find the answer. Both these manuals are a bit "minimal" in my opinion.