http://diystompboxes.com/pedals/shakamod.jpg 
Чёрт, скопированная ссылка ведёт в тупик. Тем не менее, эта самая shaka, нафаршированная разными диодами, там есть.
Вот оттуда:Shaka Braddah - OK! (pronounced Shock - Ah - Brah Dah) Preliminary version. IC based distortion with FET booster at end. When the drive knob is turned all the way down and level is up, you get a big boost. Goes from a hint of distortion to flat out heavy gain. The diode combination I chose produces a smooth nice distortion. I list a number of mods that you can make to the box. Put it on a proto board and mod it till it does what you want! Thanks to Jack Orman for helping with the design and the FET booster on the end!
Read the notes...
Shaka Braddah Mods by Doug Hammond. Check out the notes about the mods.