All I'm going to say is that, in the bottom flow in this image, published by Bob in his Q&A on Computer Audiophile, there is the clear and unambiguous possibility of DSP processing between stages one and two of the decode. Exactly how this is achieved is not, to my knowledge, public domain at this point.

[Linked Image from images.computeraudiophile.com]

Roon Developer and ex-moderator of this Forum
I am #25 in the HH1 photo of fame.