Already had a QNAP TS-670 Pro (6 3Tb Disc Drives 2Gb RAM), so I tried an initial install of Chris Rieke’s package without any change to the system. Seemed pretty successful (with exception as below), so then reconfigured with an SSD for the Roon package and a complete wipe and re-set of everything …

QNAP Roon Server - Airplay problem(s)

crieke (Christopher Rieke) November 20, 2016, 4:43pm 11

This behaviour has nothing to do with your setup. As described here: