Rural, I have a goose that was due yesterday too. One did hatch yesterday, and this one will hopefully come out tonight. I did something kind of funny, I read somewhere that when the first chick hatches and starts peeping, it stimulates the other babies and they get a peckin at their egg. Whether this is true or not, I can't say, but it does make sense. So, yesterday, before Moose hatched, I found this video on youtube....
I brought it up on my cell phone, cranked up the volume, and placed the speaker part of my phone over the bator vent. OMG it was hilarious! They started going nuts! I did it about 5 times yesterday and sure enough, moose hatched. Today the next egg was pipped, so I started playing that video again and the baby started pecking away.
It doesn't hurt to try. Don't forget too, mine will go a long time in between moving and I often probably have bad timing. I could go check on the eggs and I don't see anything, but for all I know, it was pecking for 15 minutes straight before I got to it, so it was sleeping.
YOUR RIGHT, they do respond to those that are out, that's why I say if you can get ONE out, it will be like dominos.