I actually play bass guitar too, and it was really easy for me to pick it up. I also play the organ (pretty much anything with keys), but with the organ, you have a full octave (sometimes two) of bass pedals, and I've been able to play bass pedals since I started taking lessons when I was in second grade.
Anyway, bass riffs on the bass guitar are pretty much the same as bass riffs on the organ, so I picked it up pretty quickly. My ultimate goal is to be like John Paul Jones from Led Zeppelin, because he did the same thing...played bass guitar, but also keyboards and played bass pedals for songs that needed a keyboard (live, on stage anyway). But alas, I can't seem to find a maniac guitarist like Jimmy Page, or a crazy singer with a natural vibrato in his voice like Robert Plant, and it just seems like there aren't drummers around today like bonzo!
