I just installed the KD110 and I'm having trouble hearing the person at the door.  Audio from my phone to the door works fine.  With the volume on my phone all the way up I can barely hear the person.  If I have the person get within 4 inches of the camera and speak loudly I can just hear him.  I have the sensitivity of the camera mic all the way up (to the right).  The odd thing is with the sensitivity all the way up I can hear the kids across the street making noise, but I can't hear someone standing on the doorstep.  If I move the mic sensitivity to the left all incoming audio disappears.  Any ideas?

Thank you.