Does anyone know if it's possible to use an expression to control a displacement? Basically I'm trying to create a sine wave displacement, but I cannot use the Sine or Wave deformers because the displacment has to wrap around a sphere and those deformers only work linearly.

I started doing a displacment based on a ramp and got something that looks like the image below. Notice though that my waves are a bit too linear, and not round enough. So I thought I'd write a sine wave, but I can't seem to get it to work. My expression was

int $height = 10
int $freq = 4;

multiplyDivide1.input1Y = $height * sin( $freq * time );

While the object over time does move in a sine wave like function, it did not create waves like what I want.
Anyone have any thoughts on this one?