Hells yeah--I'm looking forward to the word on the Might and the Mastery of stentorian bass fuzzamania. But in this meantime, I've got one more little essay for yallz on a developing fuzz flava flav from the J Lyon. So suck on this and see whatcha think:
OK--this is my last post on Basic Audio fuzz goodness for a little while. This one's more of a preview than a review, since it is my impressions of one of the fuzzes John is currently developing, based on a fuzz commonly known as the Os Mutantes fuzz. A very 6Ts garage-psych fuzz, this is one iteration of what were reputedly at least 8 versions of fuzz built by Brazilian electronics whizz Claudio Cesar Dias Baptista for his brother to use in classic Tropicalia band...(wait for it) Os Mutantes. The version from which John (and many other fuzz explorers) began his mutations was a fairly straightforward affair with two BJT gain stages driving a diode pair into clipping. AS for how the original circuit might sound, take a listen to this:
[youtube]http://www.youtube.com/watch?v=SEpSFOibJho[/youtube]
To my ears this is a fuzz that slots very nicely in amongst the Maestro FZ-1s and Mosrite Fuzzrites of the time, but also demonstrates a surprisingly high degree of articulation; note especially when the guitar solo kicks in at about 2:40 with lots of relatively speedy notes which stand out distinctly rather than blurring under the flubby attack that can often come part and parcel with the hyper buzz of this style of fuzz.
From this base, John has built from strength to strength, adding a pre-circuit gain pot which effects the circuit in the same manner as rolling down the guitar volume, and a capacitor blend after the first gain stage, which effects the amount of bass heading into the second gain stage and thus influences the level of lower frequency saturation, allowing for more articulation to be dialed in with hotter, bassier input signals, or at higher settings of the gain control.
Also added to the circuit is a make-up gain stage at the end of the circuit to ensure plenty of output level.
The effect of these changes and additions is a fuzz that offers many shades from crushed, kazoo-like tones with slight hints of upper octave; through more classic 6Ts buzz sounds; to clangy and sitar-like tones with fuzz gain and guitar volume rolled back and low settings of the saturation control. In fact, the sitar tones in this box are my favorite, even over designs that have been marketed as sitar simulators.
Naturally, hotter pickups provide more variations on the crumbling, crushed tones as they push more gain (and also relatively more low frequency) into the transistor gain stages that are already running hot by design. Also, the pedal really likes being pushed by other gain/clipping sources--offering up yet another palate of overloaded tones with each change of settings on whatever you've got stacked into it, rather than just collapsing into 8-bit overload mode.
One of the special things John has got going on here is an audible sense of string dynamics even with higher gain and saturation settings (and even with the transgressively muddy McMudbucker in the neck position on my Tele)--in a way I've only heard matched by the Bob Moog designed Maestro MFZ-1, a late seventies op-amp and diode clipper design. And the kewl part is that the sense of string dynamics it provides is very well integrated with the primary fuzz signal--this is definitely not one of those buffered-clean-signal-mixed-with-fuzz-sammich kinda thangs--just a naturally layered and expressive tone.
Another noticeable quality is the degree of upper harmonic emphasis present even with the guitar volume on full, which increases to near treble booser levels as you roll back both the fuzz gain and guitar volume. I mused about whether a presence shelving control or output cap switch might be warranted here for players who want to be able to roll back to light overdrive level clipping characteristics without the extra treble emphasis, but John as usual knows more than one way to skin a cat, and is already contemplating a clipping control similar to the one on the Squarewave +, which should afford a greater range of smooth low gain texture and harmonic emphasis in the rolled back tone.
All in all, John has carried the mutant gauntlet forward to produce yet another unique, alternate-universe variant of the classic 6Ts fuzz tropes, affording the user easy access to the classic buzz tone at the core of the design and a whole lot more. I'll be eagerly watching for further developments on this one.
And that, my fuzzy friends, is out for me, for now.

"In a moment of unparalleled genius, Noel Parachute headed off this potential disaster by unplugging the microphone."