Re: Help with some ideas.
Well, depending on what software you're running you will have a software mixer most likely. So I assume this is to be able to track 4 mics at once? If that is the case a mic pre audio interface like an M-Audio, Presonus, Mackie Onyx etc. would let you record 4 sources at once. To use an external mixer just to get sound into the box would not be my first choice because I think there is more bang for the buck in some other units.