Even since posting, I've gone through live shows from that time period on archive.org to see if there is another example, but all I can find is this song with just a crystals-like effect and not the pitch delay/synthy sound.
FWIW, I actually sat in with Blues Traveler last summer…https://www.youtube.com/watch?v=gPk8mL3xBGY
John used a midi board to turn on an effect that I am pretty sure is crystals, but it was so low in the mix, you can't hear it. After the show I asked him about it, and John didn't know much about his gear. I couldn't find his tech to ask…but I can fudge that with the PF or M5.
