Here's the Schematic.
http://i.imgur.com/uJitpU5.png
It is basically a drive where the bass and treble are split, for different reactions. I haven't had a chance to tweak it a lot, but I think I'm on the right track.
I started out with a buffer splitter, so that I could split the signal into two in a clean way.
I then made one have a lowpass RC network with a 10nF to ground, giving it a corner frequency of about 200hz.
Then I made another with the exact opposite, only passing the highs above 200. It makes for a really clean cut sound.
They both go into their respective overdrives. They both use a j201 at the end, my idea is to give the bass a little less gain with a dual pot or something. The j201 kind of simulates a tube, as we all know.
The treble side overdrive was given some mosfets (could change to zeners) to ground, and a saturation control. Both of these ideas were from AMZ.
The idea is that the tube sounding distortion is "warmer" and the treble will handle diode clipping a lot better. I could even move the bass response down a bit to allow for some notching of 200hz range where the "mud" is.
Still need a lot of testing, and I'm sure I'm going about things in an inefficient way, but any thoughts or ideas are appreciated.
this is an awesome road to go down. I hope to find a perfect metal sound with this method.
I made a very mild overdrive recently that friends have been trying to buy from me. The highs get "fetzered" twice, once by a J201 with less headroom, the bass goes thru a 5457 with a higher Vgs, so it stays a little cleaner. Very nice jangly sparkle. Then I ended up adding clipping diodes with a pot adjustment to the highs only. A really useful sound. basically a BMP filter as a crossover. I'm going to put yours on my list.
Then of course one could go over the top and make the thing a crossover/splitter & mixer/blender with jacks to use different dirt on each. too much. but maybe a little option here and there.
(http://i.imgur.com/glvTr7M.jpg?1) (http://imgur.com/glvTr7M)
FWIW
I posted in the past about a jazz crossover I built for a friend. I found you need to not think crossover think more overlap. When I built the first version I set both the high and low pass at the same frequency. This did not sound right then I tried different lowpass and high pass frequencies. This sounded much better.
a link to another circuit http://moosapotamus.net/paralooper.html (http://moosapotamus.net/paralooper.html)
You liked more overlap than notch Gus, when splitting to two different fuzz circuits? I think I kept the BMP notch in mine, but it doesn't seem to be there when i do a sweep.
The beastly looking thing in my profile photo is a two channel splitter blender. I put a LP switch on one and a HP on the other, but I'm using the loops for full bandwidth all of hte time. Might make a simpler one but with a high/low split. The moosapotamus brass blender looks good.
Look up "Anderton Quadrafuzz".
I'll let you all know how it goes!