Managed to get a recording of some Grays tonight. Since I am at work and stuck using my phone, I sent a link to you via email, John. Feel free to strip the sound for the caresheet.

The video can be found on YouTube also. My account there is under the handle "Trombagal". There is also one of grays and a lone cognatus calling.

I'll make a post here with the videos if I can ever get away from work...