Your hearing Todd Johnson on 6-string bass he has been backing Ron since the '90's and studied chord melody with Ron. Todd is a master of the looper pedal and loops the bass line so he can comp over it.
Yup, I've seen him using a looper on his own stuff where he's on his own with a Vocalist etc.
But with Ron he's playing straight up walking and comping, no pedals to be seen on any of these vids with Ron.
Bg