Oh I didn't realize you weren't using a bass cab. I'm not really familiar with the JC60, since I don't play guitar, but that will take away a lot of the bass-yness of the bass. If you can find a bass cab then that would help give us a better idea as to how it sounds.
That said, I might be pretty interested in buying a bass fuzz of that size in the near future. I'll hit you up.