Just found this photo of us all being in awe of @jpetazzo's talent at the @linuxfoundation #ossummit speaker party, and it's so perfect 

pic.twitter.com/M6IuzmW98j
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Something that would use rekordbox' protocol but directly talk to the catalog? :-)
My first thought is how much storage can the CDJ's actually mount..
The protocol shim sounds like a really good approach -- might be easier to get a laptop involved and use the CDJs as controllers?
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