Start off the first few minutes calling not too loud. You don't want scare him right off the bat. Build up to it, and then really start pouring on the emotion and anguish. Your imitating something that is caught or is being killed and is screaming for it's life. When we talk about non-stop it doesn't mean you can't have short breaks, time to breath and listen. I usually pause 5 to 10 seconds and scream for 15 to 20 seconds. It's even better if you have a partner, then you can call for 30 seconds and then when you pause he starts in. Much easier on the lungs. Rick was nice enough to post som youtube videos of his caling style. I will try real hard in the next day or so and post one of my calling style, they are pretty close. Let us know how you do. Oh rabbit call will work fine, I'll try and show you how I make the higher pitch calls sounds a little better, at least to my ears.