Freshwater fish tend to like the second sound, "Rattle Battle", the best! We usually start with the volume 2-3 clicks down from the default.
We've had succes with:
Largemouth Bass, Crappie, Channel Cat, Striped Bass, Bluegill, Brown Trout, and Hybrid Bass!
We've had great success in Saltwater, and we usually start with the first sound, "Scared Shrimp"! We start 1-2 clicks down from the default volume, unelss it's really rough!
It works great on:
Red Fish, Speckled Trout, Yellowtail, Drum, Flounder, Snook, Red Snapper, Sheepshead, Calico Bass, Channel Mullet, Mackerel, Black Tip Shark, and Blue Fish!