In my case (DS1621+) latest Roon update is running stable on DSM 7.0. Besides the issue that aac files respectively the acc stream of Tidal is not playing.
When Roon is not working on DSM 7.0, I can recommend is to install Roon Rock as a virtual machine on your NAS (see Installing ROCK as a VM on a Synology NAS that supports VMM). In my case this works without any problems. Even so I would prefer to run Roon on my NAS as SPK package, because I think that this is more resource-efficient, but I am not sure.
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