I have the Behringer version of the Dynacomp, and while I haven't used it in a while, I thought it worked well, and not very noisy. - Though it is in the nature of compressors to enhance noise. I'm a fingerpicker, and use it as a compressor rather than a sustainer, and I also like a bit of "sag" to get a swampy sound (the Boss LMB-3 is very good for that). I set it to unity gain when a single note is played, then adjust the sensitivity until playing three notes simultaneously is noticeably quieter when the compressor is engaged than when it is off.

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