DTX-PRO artificial muffling and transient


So I am owner of DTX6K-X set, and what I noticed when "playing" with sound settings:
1. muffling on most snares (or even other instruments; just checked snares) sounds very artificial - like unnatural "cutting" sound in some point. While some snares have good muffling, for ex. Absolute Hybrid Maple Snare has that weird cutoff at higher levels of muffling.
2. when increasing or decreasing "release" it sounds like it just modifies "middle" part of sound wave, and so on some sounds it sounds like it is normal at attack, then quiets and then is back again on normal

Are these behaviors normal?