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Noise reduction on M Box/pro tools use

I've got a promblem recording. I'm recording with a Mbox to my G4powerbook with my Shure ksm27. the mike recording is super! but the sound on the 2nd source plug that the guitar is going into on the Mbox no matter what i seem to do there is a buzzing noice. the goal is to be able to have clear sound without that buzzing so i don't have to take it out later.

analog noise reduction, Telcom C-4

Hi,
I have an oppurtunity to buy a system of Telcom C4 noise reduction units. (It's not the kind of deal that I can try them out, and then decide if I want to buy.) Does anybody have any experience with these? Almost everything on the web that I can find is in German. I am curious to know how the sound compares to the various dolby Noise reduction units.
thank you.