Sorry, I don't have a recording, but the friendlier geese at the lake make this sound when I approach them and I wonder what it meant. It is a series of short "bup bup bup" sounds, usually low in volume and tone. Their head is up and they're watching me when they do it. I did it back to them and they seemed to perk up when I did that. In another area, these two geese that would scream and hiss at me would change to the "bup bup bup" sound if they realized that I was feeding the ducks and wanted some food, too. And, they would continue to do it as long as they seemed to think I had more food. It seems to be a friendly sound.