Thanks fellas,
They call it the Witty-Wha-Too. I don't have a clue about the name, it sounds more like the title of a 50's tune. If you haven't watched the video, you should. He does a great job w/ the soft whistles, purrs, and clucks. As I indicated in my original post, with scratching this is a great call to "close the deal" on hung-up birds, but I use it mainly when I know I'm in the vicinity of birds which are not talking, but routinely cruise the area. As a general rule, I'll cut a little brush or set up where I'm partially hidden and really comfortable, to eliminate extraneous movement, since the birds will silently sneak in. This is a great call to use in the late afternoons near a known roost area, and I've had hens, jakes, and longbeards come in and usually, if a little low movement is possible, will utilize a trough type slate w/ the mouth calling to simulate "flock talk".