I have one of these devices, also got it from Jim Brain; worked wonderfully, until I sucked the (way too long) power cord into the vacuum one day when I didn't notice it was hanging down off the desk. Still need to figure out how to put it all back together. In the meantime, I just use my C64 with MSSIAH as a MIDI synthesizer...still need to install the SID2SID so I get six channel stereo sound.
Old machines have so much character and charm. I find myself browsing old-computers.com pretty regularly, and if I don't stop myself, I go searching eBay for the more interesting ones.