> I thought maybe there is still something going on with the RBX
I'm afraid not, I only know what's on the website. In the absence of
any further developments from the company, what I suggest is that you
put together your own web page for RBX 1600 owners, find a free
software project that is working on similar media jukebox systems, or
maybe start your own.
That way you can collect and archive source code for and information
on these devices before streetfiresound.com disappears off the
internet. At the very least it would be a good idea to take a backup
of that site with wget -r or similar.