[LAU] realtime midi from audio?

Hi folks, I have a vocal harmonizer pedal from TC electronics which takes input from my guitar, and my vocal microphone and determines what chord I'm playing, and creates vocal harmonies. I'm wondering if there might be a linux program to determine the chords I'm playing,, on my guitar, and turn these in to midi notes, and play a synth or sequencer along with my guitar. I'm not looking so much for a midi guitar because I don't want to modify my instruments, and I don't always play the same guitar. but this vocal pedal does a pretty good job of tracking chords on my guitar, so i was thinking maybe a program could do the same thing, and with that i could create midi accompaniment, maybe driving a sampler or something. this is just a dream fueled by a lack of steady bandmates, but a guy can dream right? thanks so much!.