I need some shelving booster design idea.

[OnLyTNT]

Hello, this is my first post here  .

I need a booster like treble booster with adjustable frequency option. I want to set high pass filter frequency (shelving frequency) between 400 Hz and 1 KHz. I'm good at electronics, can desing (mostly logic circuits and microcontrollers) and build own circuits (diy pcb and soldering skills) but never designed  an audio circuit before. I need some ideas about where to start. By the way, I'm planing to use FETs, I have some j201 around.

Another question: I modified my Digitech Death Metal pedal, may I post a short article about how to modify it?

Thanks, in advance.

[petemoore]

I need a booster like treble booster with adjustable frequency option.
  Don't we all ! 
  I want to set high pass filter frequency (shelving frequency) between 400 Hz and 1 KHz.
  You're probably as good or better at math than I, speaker tone and tweeking aside...adjustable frequency option makes the math-less equations less dependant on good math skills.
  I'm good at electronics, can desing (mostly logic circuits and microcontrollers) and build own circuits (diy pcb and soldering skills) but never designed  an audio circuit before.
  You'll probalby learn a few things quickly...
  I need some ideas about where to start.
  FAQ, GEO, ROG, any of the links...etc.
   By the way, I'm planing to use FETs, I have some j201 around.
  Fine FET my friend ! Thing is with Jfets..there's ~no current at the gate so bass rolling off there isn't easy like putting a smaller cap on the input like a bipolar transistor, bass can be rolled off but after amplifying, but to get signiff treble 'boost' takes such a dinky cap at input I gave up...and went with capless input like other Jfet designs.
  See Fetzer Valve, Strato-blaster ...
  Another question: I modified my Digitech Death Metal pedal, may I post a short article about how to modify it?
  I have no particular interest except a small passing curiosity..

[QSQCaito]

Isn't this a work for the Omega at ROG?

[mac]

I experimented a little with fet boosters based on some ideas I found here and there:
http://www.diystompboxes.com/smfforum/index.php?topic=63013.0
http://www.diystompboxes.com/smfforum/index.php?topic=60345.0

mac

[OnLyTNT]

Thank you guys. Omega looks like it does the job. I'll check other links as well to gather more information. Thank you again.