Something like this with 8 inputs and EQ would be all you would need.
http://www.zzounds.com/item--BEHXENTX802If you need a mixer with FX like reverb, chorus, delay etc they make one for an extra $45
http://www.musiciansfriend.com/pro-audio/behringer-xenyx-1202fx-mixer#If you don't have a digital reverb that may be worth thinking about. A touch of reverb would really sound nice with the theremin.
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