Holy Crap I love that ! That sounds so f'ng cool, reminds me of Geezer. I really liked watching your pick technique, much like mine.
Thanks, Scott! The Geezer thing is probably no coincidence - big Sabbath fan here.
I'm mostly a fingerstyle player out of habit, but still trying to correct that
Half the time I can never find a pick, though, and so I end up doing what I did there - using my fingernail!
I'm working on another, slightly more elaborate box now that will serve as a stereo bass overdrive and/or buffered splitter. So rather than use a passive Ric-o-sound-type splitter, you can run a TRS (stereo) cable from a 4001/3, Magnum, etc... into it and add some grit independently to each pickup. It'll then either mix the pickups together into a mono out, or let you send each pickup out of its own stereo output - to separate amps, or separate channels on a board.
The overdrives will be roughly similar to that zombie fuzz above (but with switchable clipping diodes for different sounds), and each OD can be bypassed using those red-tipped switches (if I end up making more of these, the enclosure size will grow a bit to accommodate a pair of footswitches in place of the toggles).
If used with a normal bass (mono), the blue switch at the bottom will selectively cascade the overdrives in series - so they can both chain together and process the mono signal.
I built that enclosure last week, and I still need to build up the final circuit on perfboard and finish the internals - hopefully this weekend. I'll post some sound clips once I get it finished and have time to record it.