Not sure where you get your information about "only 2 noise to counteract". It is not quite clear whether there is 1) "unlimited base noise" (i.e. silence works as a full perception penalty regardless of special noise), or 2) "capped base noise" (e.g. the 7 difference between standing still and moving), or 3) "no base noise" (reduces only additional noise, does not help normal stealth). Now this can probably be tested ...
The debug mode map is "acoustical distance" (= your distance penalties on a listen/song roll) and does not answer the question.
The debug mode map is "acoustical distance" (= your distance penalties on a listen/song roll) and does not answer the question.
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