Rather than re-write the excellent guides on the sites above, I’ll just produce PDFs with some additional notes for now (of course giving credit to the original author)
Sept 2012, the Stereo mod has been updated with a new circuit to amplify it to a more suitable level. I’ll add my photos soon showing how I interpreted MKL’s diagram :-)
Bad_Ad84 is looking at becoming an authorised UniBios installer, might be worth contacting him if you are looking at installing one (not all MVS boards have sockets on to easily swap the BIOS)
Here’s my finished CMVS, not as pretty as some of them out there, but not bad either!