i have uploaded these clips of my yamaha RBX375 wired passive.
there is a slight "effect" on the tracks, it sounds almost like a reverb. this is not how the bass sounds, i have no clue though as to what has caused this effect.
in all 6 clips, the very first part (about 10 sec. each) is played with a pick. the bass is strung with GHS 3060 black nylon strings.