Read the first part of the chapter on “Filters” in Miller Puckette’s The Theory and Technique of Electronic Music, at least through the section called “Taxonomy of Filters”.

If you haven’t yet done so, study the MSP Tutorial chapters from the previous assignment:

MSP Tutorials 27-31.
27. Delay Lines
28. Delay Lines with Feedback
29. Flanging
30. Chorus
31. Comb Filter