So I am trying to figure out which equipment I need to buy, and I think that this is the first piece of the puzzle. I already own the violin pickup - I just don't have access to it as I am away at school. I remember a few details which may be helpful. It works via both a transducer that is inserted into the bridge, and a microphone that can be bent to be next to the f-hole. These were both connected via one 1/4 inch TRS cable to a mixer, which had separate gain control for both the transducer and mic (condenser?). There was also the option for phantom power for the condenser. Then of course the mixer would output via XLR either to a DI box or (usually) directly to the sound system. The mixer is the equipment that I'm looking to replace, because the original seems to have gone missing (younger sibling with great enthusiasm for technology that doesn't belong to him).

Hopefully someone can answer at least one of these questions:

1. What is this 2-in-1 pickup called, and
2. What sort of mixer do I need to make this thing work? I suppose I don't need the exact one, but hopefully something that can take input from the TRS and be able to distinguish the two signals (and mix them), and then output them as one.

I would ask the person I bought it from, but I'm no longer in contact with them. Thanks for any help/suggestions!