[Andy A.]

Bill-

I think I see what you want to do. That ebay item does look like something that could be useful to you- assuming it has an output for the mixed channel. If not, you would need to do some wiring of your own to get the mixed channel that is feeding into the cassette to run to the laptop. It's doable, but like I said before, custom audio work usually is poor compared to a professional.

-Andy A.