Played through the first couple stages.
I'm really liking the music the guy put to it.
Also, the graphics reminded me of Jill of the Jungle for some reason.
If you mean sin(x) (what's the h for?) then it is just steady constant tone, no change in pitch.
http://en.wikipedia.org/wiki/Hyperbolic_trigonometric_function
yeah, I'm pretty sure a hyperbolic function wouldn't even sound like anything