Was your bass tuned B-E-A-D (low to high) for it's raining/i'm crazy?
you are the first person to actually notice that. all the bass (and everything) is actually done on keyboard, and i use notes all the way down to B (because i can!) but my real bass is only a 4 string. so in the videos, to keep some appearance of musical accuracy, i play everything a 4th up. (otherwise, what would i do on those low C's) so this basically simulates the appearance that i am playing a BEAD bass. this can be problematic when the fills get really high. on some songs that don't go below E, i just stick to standard