Jay

If you want to use Sooloos then in the short term use the MD600 as Store and Core. If I understand you have all your files stored natively on either a disk or the QNAP? If so then assuming you want to try Sooloos then just use Control:Mac or Control:PC to import them to the MD600, if you also want to be able to try running Roon just leave them where they are and setup a Roon server (PC with Roon on it) and add the storage location to Roon which is easier than it sounds and does not modify your files, try the Roon Labs community for guidance, just Google it.

Cheers

Russ

I run Roon with an 818v3 and two MS600's and it is rock solid, personally I find it better than Sooloos.