I appreciate all the informative responses from all of you. I found the original of Tree Top flier by Stills, that is closer to the sound I can not find. I don't expect everyone to reiterate everything that was said above. I did read them all.
The sound is sort of a boing, rounded sound. Sounds like compression maybe to take the brashness out of the treble of the strings.
Listen where he solos at about 2:00 minutes. It is very clear there.
https://www.youtube.com/watch?v=duAn9ZBgD6k&feature=relatedGene