Yes the Pi 4 has resolved the issue. Now to play with settings which I’ll be honest I don’t understand at all!
On a Roon it is showing I am running poly-sinc-ext2 DSD7 256+fs SDM DSD256 and it sounds very nice. I’m slowly wading through what the various filters do and mean from a technical and sound perspective but I must admit I’m well outside of my comfort zone
Where would I download your NAA installation from? Sounds interesting.