So I bought this ds-1 wich is modded. It sounds pretty awesome fat distortion/fuzzlike sound.

It has a switch, a diode changed to an led, some tied together resistors and a capacitor soldered to the back of the board.
I've searched the web and only found the diode to led mod which is called the Philthy Mod.

I'll add some pictures and maybe you can give me an idea of what was done to this thing.

Thanks in advance for any kind of help ;]!
31032013189 2.jpg
31032013188 2.jpg
31032013186 2.jpg