I am trying to write a Note Analizer. Something that when the string is played gets captured by the sound card and it tells you the Hz of the note.
There are a ton of programs that do this already but I got a twist that I want to try

I tried using FMOD, could not get much out of it. The record sample is good but could not figure out how to get the Hz in any way.
Can some one help please?
Thanks much,