It's admirable that you are so specific and resolute in your statement. It's too bad that your statement is demonstrably incorrect. All Macbook and Macbook Pro models, except for the Macbook Air, have analog line-in jacks. the 15" and 17" Macbook Pros have a dedicated line in jack. The Macbook and the 13" Macbook Pro both use a single 1/8" jack for either analog out, digital out, or analog line in, depending on how that port is configured in the system preferences.