freestompboxes.org

Edit: That's the real link for the mod: http://zorgeffects.com/index.php/en/blo ... ass-mods-2

And it's also in french: http://zorgeffects.com/index.php/blogfr ... -bass-mods

Aaaannnd one last thing: C27 might be a 100pF or something smaller as the theoretical frequency response of the tone stack with a 3.3nF cap is almost the same than the real frequency response with C27+3.3nF measured on the spectrum analyser.