keyframe, can you adjust the curve?

Hey,

I was wondering if I could change the curve/linear line in fcp to another curve. For example I zoom in on a object, but I want it to go fast in the beginning and slow at the end, without making new keyframes (so it goes smooth). Like how your sound curve looks like. To try to make it more clear, a lineair line to a curve or bow, like in "motion". In motion you can say how the line should be between points (curved, straight or whatever). So is this possible or not.

(I tried google but I couldn't find it).

Pardon for my poor english.