Mysterious Maxon D&S

[served]

Hi.

Has anyone been working with Maxon D&S pedals?
There are so many different schematics around and its very confusing what is what.

I am looking for Maxon D&S third edition with the same PCB as Ibanez 850 third Edition PCB but with some minor changes.
its a very specific request because it has a sweet low end and this is what I am after.

I need a schematic to do the mod to the Ibanez to see how different it really is.

There are
OD-801
OD-808
OD-820
OD-880
And probably some more.

Any information?

[served]

One more very uppsetting thing is that according to this page http://www.kitrae.net/music/History_of_Big_Muff_Clones.html

They never used Opamps.

But this page shows that they did http://www003.upp.so-net.ne.jp/yochan/DS2mod.htm
Also Maxon claims that they are using JRC4558 opamps.
And if its claimed to be an Ibanez 850 then it could not have any IC inside.
Lots of information but nothing useful.

EDIT:

If I understand correclty, then its the OD 801 that I am after.