Doesn't Kontakt have user adjustable reverb. As stated earlier, check to see if the synth itself has a reverb setting.
But, since you are new, I wonder if you are hearing a slap-back delay/loop-back produced by the latency of your computer and/or soundcard/interface. This is common for newbies to run into depending what you have connected to your computer. Also, if you are using a gamer type of audio/video card you might have ambience settings there turn on. If that's the case check your soundcard properties.

Post your system specs and what you have connected and how you have it routed.


Does the noise in your head bother me ?