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Rack Mount Fuzz

BOSS SE-70 might work, though it still doesn't sound as good as pedal board fuzzes. But combine the drive effects, EQ, and sometimes bass amp sim to help sculpt the fuzz and you can get there. Pair it with the noise gate to tighten it up and quiet it. Mine is shelved, but I was attempting to use it for fuzz only for a while. Downsides are: power brick, 1/2 rack so needs a shelf, slow bypass.
 
The Chandler Tube Driver came in a rackmount version, but it's more of an overdrive. You can get it to sound fuzzyish though. They sound great if you can find one.You could write B.K. Butler himself. He is making the pedal version again and maybe he would do you a rack unit and fuzz it up for you.
 
Here's a quick unrehearsed riff using my BOSS SE-70.

Notes: I've been playing bass for about a year and you'll hear that in my playing and picking technique; I have a silly high gear-to-talent ratio; I have limited recording skills even though I've leveraged those limited skills into a mostly passable demo for my current band.

Signal chain

* Lakland Skyline Duck Dunn with Lindy Fralin and LaBella Flats, tone rolled probably half way off
* BOSS SE-70
* Line6 M9 (DSP bypass, been testing it and forgot to unplug it from the signal chain)
* Aguilar DB791, treble cut totally, mids 1 O'clock, bass 12 O'clock, no bright or deep
* DI out into M-Audio ProFire 2626

Clip includes the following:

* Clean sound
* Fuzz sound 1 using Guitar Multi 1, comp, fuzz, eq, noise gate
* Fuzz sound 2 using Guitar Multi 1, comp, fuzz, eq, noise gate
* Fuzz/distortion sound using Guitar Multi 1, comp, crunch instead of fuzz, eq, noise gate

I can't recall what tone/eq I leveraged, but I usually cut the tone settings in the comp and fuzz/crunch to shave off treble, then in EQ cut the sub bass, boost low mids, usually scoop some mids around 800-1K, and further cut the highs.

This is just a small sample of the possible dirt sounds you can get out of this thing. There's also overdrive which to my ears sounds merely OK (high noise floor which is obvious even with a tight noise gate) and sounds best out of the Bass Multi algorithm as it includes a dry blend. There's also Guitar Multi 4 algorithm which also provides a blendable dual signal path for dry/guitar effects, which you'd theoretically be able to leverage to blend your clean bass signal through. But Guitar Multi 1 which I've chosen for my fuzz/dirt as heard does NOT include any dry blend at all, that's pure effect signal.

The sounds seems much more bass laden and full to my ears when pushed through my Accugroove El Whappo Jr vs listening back to this recording through my tiny monitors.
 
Forgot to mention I currently control my SE-70 with a $10 2-button footswitch I made from off-the-shelf Radio Shack parts. I have one button bypass the SE-70, and the other cycles through the patches you hear. It actually supports 3 footswitches and one expression, and I suppose you could just use a footswitch in the expression jack though I never tried. But that's quite a bit of non-MIDI control.