I used to have a party horn I got at a New Years Eve party that worked great. It went up an octave every time time you blew it, for three times in a row. It sounded similar to something you'd hear in a Three Stooges movie. And the turkeys loved it.....I got more answers to that than just about any other locator call I've ever used. I lost it, and haven't replaced it since, but I'm constantly on the lookout for one!
When gobblers are in the mood they will often sound off to any noise and often to loud noises. I have heard them gobble back to the sound of a swing gate, car doors, car horns, crow calls, owl calls, gun shots, coyote howls, elk bugles etc. etc.