I know this sounds funny, but this is exactly the way I too discovered how to gobble with a mouth call, it was purely by accident--from there I could refine my 'technique' at least enough not to slobber all over my self[:D][:D]
Hey, don't laugh (at least out loud). I don't use a mouth call when I gobble. Just my voice but I do the head banging routine. Makes a good jake gobble.
"Remember, you're never too old to have a happy childhood."
Try this video I found on youtube.com last year. Haven't been able to do it myself yet but I'm gonna keep trying to I get it.
That gobble doesn't sound like any turkey I've ever heard in Alabama, not enough power and air from down deep. Maybe a rio or merriams, but definitely not an Eastern. Sounds more like some kinda moorhen on crack. I can't gobble on a diaphragm but can with my natural voice.