LFO(designer) values to target comb filter pitch/note?

heya - any idea what the exact values would be if I wanted to target/tune the comb filter with a custom LFO ?
lets say C3 D3# G3 for example?
would it be a relative offset from where I have it? or total values? 128/available note steps = knob values per semi tone? so many questions. can’t really make sense of it tbh…
thanks!