I have 2 ropes on my stand. 1 for pulling up my bow, the other I tie a log and leave on the ground. When I think there are no deer around and I'm blind calling, I'll shake the rope with the log on it to crunch and smash the leaves underneath. Seems to add a touch of realizm to my grunting and I've had success with this method. If I'm muzzle loading on the ground I'll shake atree and make noise while grunting too.
Does never pay attention to my grunting. They can be 30yd.s away and I'll grunt at 'em to pass time and they rarely even look my way, even while getting louder with the calling. Kinda gives me a complex or think my call don't sound like a real deer. But the bucks do respond 75% of the time.
Good luck!