I've used wounded-rabbit tapes as well as a mouth-blown call. Night time, I call, wait, call, and then if nobody shows up to play I move on. Daytime, I sit out of sight of the edge of an open area, playing the wind. First calls are a bit loud and then after the first burst of agony I tone it down in volume. Then wheeze and whine sorta softly.
I've tried other critter-tapes, but the rabbit works best for me.