I'm purchasing a new AVR with digital inputs. I want to record some old analog records to minidisc. Will connect minidisc to AV Receiver with optical cable but turntable connected to AVR with analog RCA cables. Can I use the optical input or do I need to use the analog inputs into my minidisc recorder? Are the optical and coax inputs interchangeable? If I use coax or optical input (into AV Reciever) from a DVD do I need to use the same type out to a recorder? The AVR's seem to have limited Digital outputs.