It's pretty clear now that the buzzing is due to a shielding problem with the mics.
Point 1: Putting my finger on the Korg screen causes my mics to buz (this is not the case with the korg bundled mic)
Point 2: Putting the cords of the mics near the korg screen causes buzzing (this is not the case with the korg bundled mic)
Point 3: The the guy from Korg says that the korg bundled mic is split almost near the connectors thus results in better shielding.
Point 4: The mics I am using are two totally separate wires.
Conclusion: My mics are not shielded and I should call the company of the mics to do something about this.
Aegret, I know exactly what you mean by a digital sound, however I think you are a ****bit**** biased. Firstly, the digital sound you hear is due to the frequencies of the sound spectrum of the file being randomly taken away. That is because the noise reduction algorythm is attempting to catch the random frequencies of white noise and other stuff. Now, you probably know that already. However, what you may not know is this: (oh and a disclaimer I only have experience with RX's noise reduction and the following is speculation)
Noise reduction algorythms are extremely sensitive. One tiny tap, one tipy blip, one tiny click when retrieving a noise profile will throw the noise totally off and it will start removing precious frequencies that will cause an inconsistency with the sound spectrum resulting in audible warbling. What I suggest is to get what I might call a noise profile of your setup. You have to go into a dead silent location and record silence with your setup. That will give you the noise profile. You can then use that as your nosie profile for all your recordings with that specific setup. Always reduce noise in moderation unless you are confident that the quality will remain with high noise reduction. Do not attempt to get a noise profile of a non-dead-silent location.
Maybe you know all that already, but maybe you don't know this one!:
With iZotope RX, you don't have to reduce the noise of the entire sound spectrum. You can get apply noise reduction ONLY on the lower frequencies. That will result in the preservation of the higher frequencies in which is most susceptible to the warbling effect of bad noise reduction. In addition, it's harder to hear higher frequency noise.
Edit: One obvious thing I forgot to mention you may already know is that noise reduction causes the most problems when removing nosie from a recording with loud AND sound sounds. What I'm basically trying to say is that you should give noise reduction a chance and use it very carefully to achieve recordings with a little bit less noise. That little bit can make a difference.