Clayton Bailey expands on the classic boinging-twang of the jaw harp with myriad handmade brass variations. Take for instance, the Gunharp -

What do you get when you graft a jaw harp to a deer rifle? You get a very accurate jaw harp called a Gun Harp. You can brace it against your shoulder, point it and pluck it very accurately - with pinpoint precision. It sends an irresistible call into the wild to flush out humans or animals.

The Gunharp has been used by Hodag hunters in Northern Wisconsin, USA. When played correctly, it is said to imitate the mating call of the female Hodag . For this reason, a Hodag in heat is said to be in "Boing".