Hello again, I've had a couple of failed goes at making a software only polyphonic guitar synth and came to the conclusion you can't really.
So this is my latest attempt, which to my amazement kind of works quite well. It's just for the first 5 frets and only one velocity so far. I've added a synth from my 'stamp album' project for instant sound. The project also outputs to the standard midi out .
You will need to tweak the onset level for your input. I've set it at 54 for my guitar and tweaked lower as the strings get lighter, and a well tuned guitar of course.

This is purely WIP test piece and any comment/improvement would be welcome as usual.

The file is g-syn-2.pd in the g-syn folder