I've made some research and I've found a great program that may do the trick. It's called Rakarrack.
It has many effects for the guitar, and it includes a pitch-to-midi converter. Although it is monophonic (it will convert only single notes) but I think it can send the midi to Port-0 to be used in Pianobooster, I still was not able to test it, though.
http://rakarrack.sourceforge.net/