Hmm… don’t know what happened but I can’t seem to get the Native DSD option to come out in Roon.
I’ve now upgraded alsa-utils to 1.1.3 by getting it via stretch, and have also applied the kernel update that was mentioned in this link that you referred me above.
Is there any requirement for a certain Kernel version? Mine is still showing version 4.4.50 which came with DietPi 145.