Although I own a few basses that can be run in stereo (Alembic Series I doubleneck, Stanley Clarke with Anniversary electronics, Rickenbacker 4003), I have never actually done it. Well, I finally put together something that will allow it to happen:
I'm using the gray Rick-O-Sound box in the bottom right (and it looks like bass & treble for Ric is different than Alembic - had to reverse them) - the neck pickup signal is going to the yellow mute box, silver CAJ V-COMP tube compressor, blue MXR bass octave divider, into one channel of the Mackie mixer at the top left. The treble pickup signal goes into the silver A/B box (acting as a mute box), white CAJ V-COMP tube compressor, Fulltone Bass-Drive, MXR 10-band EQ, then into the other channel of the Mackie mixer.
The mixer is there because I don't have amps at home and wanted to make sure everything worked, so I was running it through headphones - sounded pretty good! The MXR is set up in the picture as a crude high-pass filter, since I didn't have my SF-2 in the chain. Ultimately I plan on using the MXR as a clean boost for solos, in which case I would have it set differently.
I don't see myself using this setup very often - I was motivated because the Northern California Gathering is coming up and thought it would be fun to try. A blue box could easily replace the Rick-O-Sound box for a Series instrument. The mixer isn't necessary but I need L connectors in order to fit into the final effects, so I might be using the mixer at the Gathering. Also, that way I can run both pickups out of the mixer mono into one amp, or stereo into two, depending on what I can get my hands on - I might only have my GK, but am hoping my friend can bring my PJB for the high end.
I was initially going to try and cram everything on the board, but again, I don't really see myself using this setup that often. I contemplated getting a really small board for the white compressor & A/B box, which I could also use for a break-out board I've been contemplating for an effects-loop set of modulation effects (phaser, envelope filter, maybe delay).
Finally, this rig could be run through an SF-2 as I mentioned about, using one channel as a high-pass filter so as not to have phasing problems with the other amp. At this point I don't plan on going that far at the Gathering, running the low pass on the neck pickup and adjusting either the MXR EQ or graphic EQ on the PJB should be sufficient. Any thoughts?