Circuit to imitate guitar tone rolled fully off? When its not?

[blackieNYC]

I'd like to build a circuit that simulates the filtering experienced by a guitar with its tone rolled all the way back. When it is not.  Your average guitar, any guitar- in that ballpark. 
I want to put this in front of a scrambler, and give it that tone-rolled-off tone that brings out the octave.  But without doing it at the guitar.
This is harder than I thought. I've tried a very sharp filter that's a bit like the anderton freq booster.  It doesn't do it.  I don't know if its the steepness of the rolloff, or finding the right cutoff frequency. I've tried a daisy chain of rc filters - 3.3k & .1uf, which should roll off at 450hz. If you put 3 of them in series it should be a very steep curve.  Measures great, but still always a little brighter.  Tried these filters before and after an op amp with makeup gain.  Tried up to a .47u cap in the feedback loop with the 100k gain pot.  Getting close, but losing sustain.  Anyone know how to do this?  Can this be imitated without an inductor?  I have a couple 10k 1:1 transformers around, that's about it.

This helped a little but was still pretty far off.  Otherwise very cool!  One op amp stage, one pot, variable center frequency booster.  thank samhay:

I'm not quite sure what you want the tone control to do, but may this will be of interest?
http://www.diystompboxes.com/smfforum/index.php?topic=104233.0
(It doesn't oscillate at least).

Still searching.

[PRR]

The guitar pot interacts with the pickup inductance.

You probably want a "fake pickup".

Take the magnets out of a crap pickup and seal it in a tin (steel) can.

Search the web, someone found a $3 transformer with pickup-like inductance for pickup simulation.

[blackieNYC]

Excellent!  And here it is, our beloved AMZ:
http://www.muzique.com/lab/pickups.htm
I think I have one of these transformers.

[PRR]

"Update 21 Aug 2006:", with a lo-Z source and hi-Z load, should act a lot like a guitar's onboard tone.

[blackieNYC]

And it does!  I have a pickup with tone control (volume up full- a fixed  resistor to ground) simulator in front of a scrambler.  And just for fun, an op amp boost in between.  Without the boost, and the (pedal's) tone rolled back, I get the nice scrambler octave without turning down my guitar's tone.  If I pan the scrambler's blend pot over to the dry, I get a guitar output sim to play around with. The update 21 aug 2006 version
But there's more- with the op amp boost on in between the sim circuit and the scrambler input, you get this awesome swell, which starts out like a scrambler getting hit hard, but then blooms into a stronger octave.  Must record samples.  It's the kind of sound that can make you play slower.
If you set the scrambler to less octave drive (an original feature) and I dont roll off highs with the pre-tone of the guitar sim, and hit it with a little boost, the scrambler makes an excellent bright distortion.
Mr Hammer has pushed the idea of a boost before a scrambler, and it is great.  Clipping diodes would be easy to add in the op amp boost, but I got a sound that said " quick! Put it in the box and close it up before you muck it up!" And thanks PRR.

[StephenGiles]

Surely the circuit of the DeArmond Tone/Volume pedal did that.

http://www.pat2pdf.org/patents/patus2986953.pdf

No values but the circuit is there!

and the Fender one!

http://www.harmonycentral.com/forum/forum/guitar/acapella-29/1739827-