Programm keyfollowing for filter

Hey I want to programm a keyfollowing function for the biquad object.
The goal is the keyfollowng, like you can find it in synthesizers where the frequency is automatically adjusted to the key you press.

I'm sure there's some general rule on how the adjusting works -> how many freq is added for example for a pitch c3 and how much for a pitch c1.

Would be glad if someone could help me out with an example patch.