In the example "3-4-2-10-karplus-strong3.pd", there is a calculation which goes like:
[expr 44100/($f1*1.09545)*0.025)]. I cannot understand what 1.09545 and 0.025 stands for. I cannot understand the logic of it. I'm not skilled in math, so I
need to visualize things in order to understand them. Can somebody
explain me that calculation. The example patch is in the attachment.

Thank you.

http://www.pdpatchrepo.info/hurleur/3-4-2-10-karplus-strong3.pd