“I had this kind of funny thing going on with the bass guitar.”
I'll say! Season 3 disc2, the Elaan of Troyius score. You can hear it in track 9 “Realization-Battle Stations” from about 1:18 to 1:45. Also in track 10 “Close Call” from 0:19 to 0:30, and again from 1:00 to 1:05.
What's he doing with it? Sounds like someone's playing it with a bow, or sliding a guitar pick along the strings, or something.