A number of years ago, I was able to connect my Mac to an external stereo system so I could transfer cassette tapes to MP3s via Audacity. I am attempting to do this again, but it's recording sounds from the room and not directly from the stereo system. I am using RCA hooked to the stereo and the 3.5 into the input (headphone Jack, I think it is?). I went into preferences and selected it as the input (versus an output) and it's just not doing it. I did that on my 2019 MBP. I decided to haul out the iMac 2011 and try it there. Still...no go. I cannot seem to get this figured out why it won't work now. Did I miss something? Any help would be appreciated!