i never tried anything other than the old trusty crow call. ive heard them gobble to everything from owls, crows, peacock calls, geese, yote howls, thunder(excellent shock gobble...cant rely on it though) gunshots, train horns, door slams etc etc etc...

not sure if they would gobble at the whistle...everything ive ever heard has been a deep loud sound..except the peacock...which is loud and high pitched like the whistle...id say its worth a try...see what happens...doubt it would hurt.

ive never had trouble with the crow call. weather im in a spot with 1000 crows around or 0 crows...always seems to work all season. if a bird dont gobble im confident there isnt a HOT bird around. ive noticed when shock gobbling birds that most times they are ones that will ATLEAST talk to you...but i only shock gobble after flydown...usually after the first hour or 2 after flydown after ive lost the birds from the roost..