Ahhhhh !! Well it is good to hear that it is usable at least ^^
Then for the Hz issue, I had to make a choice. My Frequency buffer has to remain short in order to have a better reactivity and then a shorter delay for my inputs (because I can do way less math but still keep a good precision), but it means that I have a specific range which does not work for a "real Hz" calculation...
BUT ! Now that I know that it is at least usable, I'm going to start working on the "real Hz" calibration.
My only fear is that I don't get the same results AT ALL using a microphone next to my Bass Amp and using my Audio Interface... Therefore, I guess it will take some time to understand how it really works, and I might end up giving the user a setting to tweak in order to calibrate my tool the way their tuner works.