My minidisc recorder Sony MZ-G750 is on the blink & only records when it feels like it. With West End Live imminent my son has bought me a replacement from ebay. It is a Sony MZ-R501. The problem is that this has no microphone socket. Does anyone know if I get a new microphone with power [my current one doesn't have this] will I be able to plug into the "line in"jack & record? I have tried emailing the Sony customer care helpline only for them to say they don't exist as they are not on their current list of products.