The Stranger Within bassline is quite unusual. I wouldn't say for sure but I reckon Chris sampled individual notes of him playing the bassline into the Emulator (mark one, 8-bit technology!) and they sequenced it.

The bass sound is unusual there and, with him playing either a sampled fretless or a real one on When The Time Comes, they're the only two tracks I can think of when a very different bass sound is used. Warren always said that Chris was an astounding bassist and his work has always been quality.