I have a 2013 iMac that I want to connect an old tape cassette deck (see attached image) so I can digitize some old tapes into Audacity or some other audio program. Do I need some type of device that will convert the analog signal into a digital one before it goes into the iMac? Can I just connect the RCA cables into the back of the tape deck that goes into the mic input on the iMac? Is there even a mic input on the iMac? I'm not at that computer right now... Thanks for any info.