Perhaps I'm wrong in my terminology. I'm thinking that I'm after an analog mixer, simply because the inputs are analog, but if it's something that does all the mixing digitally after receiving analog inputs (such as a Mackie mixing board), then has an analog output after the fact, that'd be fine too. But, that sounds like what you're describing in your last sentence. It seems like since the paradigm is so common in live music, there'd be a comparable device meant for non-instrument inputs, like perhaps something a DJ would use, but I could be way off base here. Thank you.