Same for me... This is the reason why this is not a stroll but climbing Mt. Fuji And why it takes that long.I have a really hard time to grasp how the whole audio topology works, and where all the pieces come from :/
I just have started my PandaES to check how the working setup was built. And it turned out that v6.5-rc2 changed the device tree subdirectory structure (to the better) but that is not handled properly by my build scripts.
Why do I work on PandaES? Because it has one of the handsfree speaker drivers wired to a jumper. And it is easier to have a remote controllable setup than the Pyra. And, I have (had?) a working 3.15 AESS setup - but did not yet find the SD card.