Ok, here I am again. Candled the 2 duck eggs last night, got a surprise when I saw a huge shadow in the air sac of one.  Not in the other.   I could feel that little thing kicking too. So. I went ahead and raised the humidity to mid 60's.  Hope that is right?   Haven't turned them today.
  Haven't heard any noises
  Do they make a whistle sound?  I think I may candle again tonight if I don't hear anything by then.  If this were a chick egg, I would have thought, hey, it's internally pipped, or darn close. I check for pips and noises every now and again.