Audio Alchemy DDS I - any information out there?

As a newbie to these posts, I hope this question hasn't been worn out by now. My project is the 2-piece Audio Alchemy DDS I that I would like to get in working condition. Since technical info seems all but impossible to find, I thought there might be some individuals on this site that might know the answer I'm looking for or how to get it. What consumer CD player did AA use for the control board which was subsequently modified for use as the DDS I controller? There is the number HCD-570 on the board, which seems to hint of Sony nomenclature, but there isn't a single Sony chip to be found anywhere and almost every major chip on the board is from Yamaha. That seems unusual if it was truly a Sony product. Looking on the Web hasn't been any help to try and reference the number to a particular manufacturer. Maybe this venue will prove successful. Any and all help will be greatly appreciated.