I need to implement a in real time Autotuner and a pitch shifter. Any help is appreciated on where to start, or if there is already a version of this available.

See Else library for pitch shifter objects... autotune I don't know.

l2ork has an autotune add-on that works ok imo (& can be compiled for mac or windows as well)
https://github.com/pd-l2ork/pd/tree/master/l2ork_addons/autotune

@seb-harmonik.ar I am running on Windows, it seems that object is only for linux, is this correct?

@Joseph-Mikkelson no, the makefile should work for Windows if your system is set-up for building pd externals (I'm not quite sure what that entails..)

@seb-harmonik.ar Its says "This app cant run" do I need to open it in a certain way or do anything special to "make file" to get it to work (I am relatively new to this method of abstraction)

@Joseph-Mikkelson sorry, someone that knows about windows will have to help.. but generally you have to edit PD_PATH to point to the correct location of the pure data executable..

Pd spectral toolkit has a nice auto tune example.
search for pd_spectral_toolkit on deken