With the release of proto 512 this month, I was able to take the CDDA data from that version (it is a sample by sample match with the 510 mp3s: when using phase cancelling, only noise remains) and restore the SCD 510 image to a lossless state. I've talked with drx and this is not excatly 100% accurate (as the iso was coverted to another sector size and the file arragement changed). But, all things considered, this can be used to create a functional CD to be played on original hardware with all data from this disc being a 1:1 match with the now-lost original SCD 510 disc. Anyway, I think this is the best state this proto can be and it's the best way to preserve this build. Enjoy!