Anyone heard about CD player Modificatio

I am interested in recyling my old trust Yamaha CD changer, which works flawlessly with some sort of upgrade via an OPTICAL OUTPUT. Do you know of any people who do this sort of thing? Have you heard about MUSICAL CONCEPTS? Someone had his CD player modified with an DIGITAL OUTPUT. I cannot seem to find these people anywhere. HELP. PAUL
Try this link - EVS at, these guys seem to know what they're doing, maybe they can help - they mod DACs and Players