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Thanks for the replies.  The pedal sounds good to me.  Maybe that's it, the signal is just negative or positive side.  We'll see if we get any more replies. 

Here is the link to the Zehndrive.  Click on Manual to see the schematic in the pdf file.

http://uk-electronic.de/onlineshop/product_info.php/products_id/1211?osCsid=4bd25c9216ff4793a9b3479e9a54aae3

Then compare that schematic with the Serendipity version of the Zendrive.

http://www.madbeanpedals.com/projects/Serendipity/docs/Serendipity_ver.5.pdf

Compare the diodes/Mosfet sections and notice that they are reversed on the Serendipity vs. the "Zehndrive".

Are they identical electronically?

I recently built a Zehndrive kit from MEK Electronics in the UK.  I compared the schematic to that on the La Revolution Deux DIY Pedal site and it matched.  I notice on the Madbean Serendipity schematic that diodes D1, D2 and D3 are in the exact opposite locations of the other schematics.  For example, coming off the "-" of the IC1A, D1 and D2 feed into Q1.  On the other schematics, D3 feeds in to Q1 and the diodes in series feed into Q2.

Which version is correct?  The Zehndrive kit version sounds great, but I'm wondering if the Madbean version is also correct and which one is more accurate of the original "Zendrive".

Thanks in advance.  I'm new to the forum by the way and appreciate the value of the site.  This si my first pedal project and I am happy that it turned out for me.  Sounds like an OCD or Fulldrive almost but I like the way it sounds at lower gain settings better.  Very similar though.