Ok. So some noise was coming from a wireless system that I have in place.
Now, once I connect my guitar straight to the input I get the same noise level as if I just disconnect it completely.
Still in this situation I can make the KD hiss by increasing the drive and volume parameters (no cord connected to input). This hiss gets blocked by the Input Section Noise Gate if use it. Also I can block it with a Noise Gate stomp in front of the KD or after it. Please confirm that this behavior is normal.
This is normal.