A couple of months back I scored a rare "QBus Music Board" off eBay. I don't know a ton about it -- it was made at DEC but was never an official product and I don't know why it was made or for whom. But it's neat -- it has two AY-3-8912 PSGs to make fun tunes with. I've never found any documentation or software for it but it wasn't too hard to figure out the registers. So I did what any of us would do, I wrote a device driver for 2.11BSD (PDP-11) for it, and whipped up a VGM player. Enjoy!