i have a DS1 and i wanted to know what the difference was in the circuitry to see if it is worth modding it to a DS2. i got a schematic for the DS2 but without the schematic for the DS1 i couldnt see a difference.

http://fuzzcentral.tripod.com/ds1/DS1.gif

I doubt you'd be able to mod a ds1-ds2, the circuits are completely different. A far better mod would be to mod it to a keeley ultra or keeley ds-1.
see:
http://fuzzcentral.tripod.com/DS1.html