Guitar!!!
Guitars!!! Wooohooo!!!! Someone finally did a classical guitar piece!! Mind, the only reason I haven't is because I don't have a guitar I can plug into my computer =). Very good song though there were a few areas that could do with improvement.
You've done an excellent job of implementing each of the different guitars in but you haven't managed to get the real feeling behind it. This song isn't particularly sad to be honest. You need more crescendo's and dynamics in this song. For example, the part at 0:08 that backs up the starting song needs a more difinite crescendo, make it louder and then fade away, louder, fade away, and so forth, also make it flow a bit more. Well used hammer ons and hammer offs can really effect how a song flows, from turning a generic up down strum stroke to a irish dancing tune to and sad lament. =) I've had a lot of practice in that area since I can never be bothered to actually learn a new song.
Personally I don't think it's possible to really capture a guitar electronically, just as chorals are nearly impossible due to the fact that theres so much you can carry in a song just through the way you pluck and strum, upstrokes are different from downstrokes, using your thumb to pick instead of the index and middle fingers and using different picking techniques can all effect the sound of a guitar.
Well, it's great to see that someone's finally done a guitar song, and done it well! Looking forward to hearing more of the same =).