Software to sync, manage, remove dupes music between my NAS and 3 computers

Hi Folks,br
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Am an audiophile with a crazily large collection of songs. Since I was running out of space on my local system, I got a QNAP NAS and have put all my music on the NAS. I have about 3 computers and all I want to do is sync to the NAS, fetch just the tracks I need and then mix them up, then update again on NAS. My brother is into event management and he at times uses my mixed tracks for his events! :slight_smile: br
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I have iTunes on all of the computers ( 2 Mac Pros and 1 Win 7). But iTunes is horrifying to say the least with NAS and the updates, sync, management. Also, if something that could help my bro sync from his office and fetch my sync’d mixed tracks. br
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Is there a tool which can make my life easier? br
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Any help would be great, its too tedious with the way I am doing it currently.br
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-Brian