i don't think this will happen due to the different amounts of buffering in the 2 players. if you have specific technical questions, you need to go to the xpl message board ( http://groups.yahoo.com/group/ukha_xpl ) & post there. the author of xplrionet does not read nor post here.

there is also a rio client emulator for your pc (don't think it will sync either) available at http://www.xplhal.com. when started this client will show up in the web interface of xplrionet & you'll be able to control it just like a rio

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Will this allow syncing RIOs and SliMP3 clients? PC clients, as well?

If so, I may be in love...