Having just got hold of the UK model of the MZ-RH710, i noticed that the line in appears to be optical only. Now.. I'm currently doing a course in radio production, and i need a microphone to be able to do voxpops and the such, so here's the stupid question... Is there a portable way to turn analog into optical, i.e. a small convertver between the microphone and the minidisc? Thanks for your time, -Matt-