He plays the Jazz on "To Be Over" because it was recorded using the Jazz. He usually used the same bass he used on the album, i.e. "Parallels" with Jazz, "Does It Really Happen?" with Thunderbird, "Tempus Fugit" with Electra, etc.
When Yes started to play "South Side Of The Sky" live he played with the Lakland P-bass or the silver (?) colored Mouradian, maybe others too but never seen him playing it with the Ric. The studio version was played on the Telecaster.
They did it live during the early "Fragile" tour but I've never heard a live version from that era.
The Tele was stolen much later and he indeed used it on his solo album sessions in 1975.
On that show "Yours Is No Disgrace" starts with the Jazz but he switches to the Ric halfway thru during Howe's extended break.
Chris talks about the Tele being stolen on the Fish Out of Water DVD but I don't think he gives any clue to a time period.
Anyway, he always sounded like Chris on any bass. New Rotosounds every gig helped with that I'm sure.
EDIT: As usual, on any live YES video, the camera does not give enough Chris time.

). One of our guitarists does crisis counseling. He had 2 separate sessions today(Friday). Couldn't make the gig. We had some requests for tunes we'd never done b4 as a group. Did them any way. Crowd loved it/us.
. It does not have a true Humbucker. Wish I'd never sold my 66 Gibby EB-3.
