I can give some advice ,,,not expert though .
Have you tried a coyote howler ? Open reed trumpet style will get earbusting loud . Send them some rapid barks and a series of long howls .
Or a brayin' donkey
Or a squeeze type bicycle horn ,,,it works ,,,carryin' one myself
Let out some long bellows like a cow,,something they ain't used to hearing .
As for the birds not gobbling ,,,they'll come around again ,,,probably in one of those cycles ,,,,,,,,,,,I have endured the same thing myself here in Ohio.