No expert, but I dabble

. There are a few versions (or “Marks”) of the Tonebenders, and they’ve all been cloned a thousand times. The 1, 2 and 1.5 (which, somewhat confusingly, came after the 2, IIRC) may be a little thin on bass. The 3 may be better, but seems to be rarer, because less popular among guitarists. The Youtube channel “Theo and his pedals” has many fuzz demos, all bass (and bass IV). I think he likes Tonebenders. He’s also here on TB, under a different username that I don’t remember.
I just found “Theo”’s user name here, @DosiYanarchy. Perhaps he’ll receive the bat signal and offer his take; I don’t think there’s a more comprehensive collection of fuzz on bass videos/demos out there.
I also just noticed that I typed “bass IV” in my previous post

. That would hardly make those videos stand out now, would it?
Fuzz experts, I need some input.
I ran across an interesting pedal, the Kogoy Musical Devices Rainbowsound fuzz.
Reading the description, it is a recreation of a 60's fuzz from the UK - and simple deduction led me to believe it must be the Coloursound Tonebender.
Is the standard Tone Bender usable for bass?
Thanks for the tag!
Okay my thought it: YES on the Colorsound but NO on the Tone bender.
I suspect it's a take on the Colorsound Power Boost/Over driver.
The manufacturer description suggested that the 2-band EQ was part of the original design (which was pretty uncommon back then) but also that the original version of the pedal this is based on was a three knob setup and the gain control was effectively the volume control, with them later adding a master volume... Which is exactly what they did with the overdriver/power boost.
I like the Overdriver/Powerboost circuit on bass and currently have a Colorsound one. I prefer it on guitar as something to pummel a tube amp and prefer the Supa/Jumbo Tonebenders (which are both modified Big Muffs) on bass.
Just for the hell of it heres some Tonebender info to the best of my knowledge (which could be wrong) as the fact that there are at least 4 circuits completely different from each other that are all Tonebenders is pretty confusing.
MKI Tonebender - very similar to the Maestro FZ-1 and Rush Pepbox
MK1.5 - similar to a fuzz face
MKII - Similar to Marshall Supa Fuzz
MKIII/MKIV - I think the iii and iv are actually the same circuit and are like the mkii with an added tone control.
Supa and Jumbo and Bass Fuzz - apparently the Supa is basically a 72 Rams head big muff with the first diode pair removed, the jumbo also has final gain stage removed. The Bass Fuzz actually has a few different circuits I've found, largely being a Supa with larger caps.
Having said that I have an early 70s Supa, a late 70s/early 80s Jumbo and a 2000s Bass Fuzz currently and they sound VERY similar.