If you want to hear a feeding call or murmur, I believe that you can check out Shawn Stahl's website called fowlpursuit.com and look for sound files. Look for live goose murmur and this should give you an idea. The rhythm of these geese is pretty slow and normally when I do a feeding call it is a little deeper and quicker paced. I also mix in a couple clucks. If you can't figure it out, PM me and maybe I can help out a little more.