At the suggestion of an earlier post, I checked out youtube. On this version of "Saturday in the Park" Cetera is playing some soulful stuff.
At 2:36 through 2:45 he played such a tasty phrase; truly a creative dude......
Mike
Err..... that's his replacement Jason Scheff NOT Peter Cetera.

He has embellished a typical Cetera line though...
I CAN'T WAIT for this issue to hit the stores here in the UK!! I'm checking the shop everyday for it....
Finally, the article I've been waiting for.... and only two months after my other fave Tiran Porter of The Doobie Brothers!! Thank you Bass Player Magazine!

As you can tell by my username I'm a HUGE Cetera fan. I'm in the process of forming a Chicago tribute here in the UK but getting the other players together is proving challenging....
To address earlier questions:
Peter used the following basses with Chicago:
Gibson EB-3
Fender Precision (blonde w/maple board)
Fender Precision (blonde w/rosewood board)
Fender Precision (white w/rosewood board)
Gibson Grabber (maple e/maple board) - he hated this one
Fender 70's Jazz (black w/maple board/blocks)
Fender 70's Jazz (white w/maple board/blocks)
MusicMan Stingray (Black w/maple board)
MusicMan Stingray (Red w/black pickguard & maple board)
Spector NS-1
Steinberger
Live he played through Acoustic & Ampegs from 1967 - approx 1974 then went over to Sound City. I've no idea what he used after 1978....