Question : Compression schemes and "noise "

["Thomas Ashcraft" heliotown27]

I have a question about the Edirol R09HR:

For general specs and reference   :
http://www.zzounds.com/item--EDIR09HR

This particular model has a feature called:

"Newly developed Isolated Adaptive Recording Circuit - I.A.R.C"

Question:  Does this Edirol recorder record whats fully there  ?  - all 
noise included-  or does it aim to edit out "noise" for some 
psychoacoustic human listening or musical listening purpose?  For my own 
nature recording purposes, I need the full spectrum of "noise".

I hope my question makes sense, if not I will try to clarify further.

Thanks again in advance for any replies.

Thomas in New Mexico