dear larrman the C100 and C200 work in the same way for the pass through mode in the C100 the A/V proc. controles all the volume the only difference is the C200 has a designation for the pass through and the C100 doesn't . the way they function are the same only the nameing is different. also you are right on the money the phone stages in theses are very good and in many cases better then some of the better stand alone units.
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