pipeline.exe and mgcb.exe and xactimporter

Continuing saga of Pipeline/MGCB.
My Pipeline and MGCB processes all files tested so far except for xap.
That, I believe, is an audio support format and we should have had an xactImporter and xactProcessor by now.
Last references I have found are 2016.
Anyone got any information about XactImporter/Processor for me?

I have postponed this piece of work as I don’t need as not using XACT (Couldn’t find the tool to create the expected files anyway). I may investigate this later.