Page 1 of KARAOKE on Cyberhome AD-M512

Does anyone know how to make the Karaoke feature work on the Cyberhome AD-M512 DVD Player?
Do the Headphone sockets really double as Mic sockets?
I have tried switch the Microphone option on in the secret menu,, but still nothing.. am I going mad?.. do you need special discs?.. I have tried it with Audio CD`s.. CV+G Haraoke CD`s.. and of course a DVD (Film)

Any Ideas? Please reply or e-mail me at ydna[at]moc.tenbbig

Thanx!