Loud "spitter"

Okay, I have two openings on the water filter in my pond--one is attached to
the tubing that pumps water over my mini (3" max?) waterfall, and the other
was just shooting water out in the pond. So I go to Home Depot and get a
kind of "spitter" that shoots water up in three beautiful streams that curve
back over into the water. Lovely, and suits the look of my 1923 Craftsman
house!
Only problem, instead of the lovely musical tinkling water sound I was
hoping for, it sounds like a faucet is running in the pond--not very
esthetically pleasing.
When I try playing with the toggle switch on the pump, I get shorter
streams of water, but just as much noise and water volume. The problem
seems to be too much pressure, which I don't think I can adjust. Perhaps
the former owner of my house bought a more powerful pump than he needed
because of the "waterfall"? Must I purchase a smaller one to get the nice
sound I want? There doesn't seem to be any place to adjust the water volume
on this pump, or maybe I'm just missing it. It seems to be the typical kind
they carry at Home Depot. Help! And thanks!!
Kirsten