Yep, very difficult to narrow it down, especially when you've not given us a clue about your proclivities — are you after mild dirt, fuzz, modulation? Do you use delay or reverb with your bass? Are you looking for a preamp with DI capabilities?
There's a number of cool utility builds you could do, too.
Some great suggestions already, but there's plenty more besides...
BARRANCA — YATS based on EQD's Palisades (minus boost); mod it for better bass response
BASSIFRASS — Frantone Bassweet
CHAOS BOLT — Dwarfcraft Eau Claire Thunder (MUFF)
CITRUS PRESS — Orange Squeezer with a dry-blend
CRANKY SPEAKER — EQD Speaker Cranker which you can easy-peasy build a Southampton Fifth Gear on.
FEDERALIST — Dist+ & Muff
FOOTSWITCH DI2 — a utility build to add a DI to whatever other circuit you want to pair it with
HORDE-HOWLER — Fulltone Bass Drive
ILLITHID — Dunwich Cthulhu Si/Ge/MOS
INTER CONTINENTAL — EHX BMPOA
JOCELYN BELL — EHX Pulsar tremolo
KENTAURIDE — TS10 Tube Screamer and a silver Klon Centaur; there are good mods out there for bassifying the TS10, and Chuck D Bones excellent mods will make the Centaur positively bombasstic!
KOSSACK Козак (Cossack) — another Klone. Again, Chuck's Bass Mods turn any Klone into a bass blasteroid.
LAWN DARTS — EQD Arrows (nee Electra), swap out C1 for 1µ or 2µ2 as well as up to 470n for C3 and BOOM!
LIFESTYLE — fantastic phaser by CultureJam that can go super fast for in your face phasing/pseudo ring-mod or go super-slow for some subtle je ne c'est quoi flavours.
LILLIPUT — SmallSound/BigSound MINI — once upon a time a highly sought after circuit by the TB punters, can't wait to build mine.
MENHIR — another must-build, based on MountainKing's Megalith
PRISMATIC EQ — Boss GE-7B, but note there's a mistake in the build doc — C14 is NOT 3n9 for bass, rather it should be 5n6.
RED CLAY OD — dip your toes into SMD with this YATS, it has a bass-friendly clean blend.
RNGD — random noise generator meets delay by Janis.LV, great noisemaker. Check out JanisLV's youtube demos if you're into cacophonics.
SONORUS — a modded Blencowe Reverb using PT2399 chips instead of a Belton brick.
SUNNBEAM — a second Sunn to warm your tone, based on the Sunn Beta bass pre.
SUPER-TROUPER — build a SunnT on this one.
SWAGGER — EQD Plumes, but you'll want to build it to Blumes spec.
TAPE DELAY — Aleph Null's funky PT2399er; I was going to get this one, but you can just PM Aleph here on the forum and get one of his boards directly, like I did.
TEST RIG — quick test a circuit, but there are other similar devices here, MadBean, Fuzzdog, JMK... and more feature rich offerings elsewhere — highly recommend JMK's deluxe test-rig type PCB.
ULTRALECTRA — a feature-pimped Electra. Breadboard which Bass-mods you want first before soldering.
Buddy's suggestion for breadboarding a BazzFuss actually does apply to the ELS (Effects Layouts Storyboardist) offerings:
BOOTLEGGER is based on the Walrus Contraband, which in turn is based on the BazzFuss — it's a great circuit to toy with on the breadboard before committing it to solder on the ELS Bootlegger PCB.
Or build yourself a BAZZFUSS on an ELS FireBoltFuzz, based on the EQD Bellows, which is another BazzFuss variant.
DOD FX91 Bass Overdrive
