Zvex SHO diodes?

[Canucker]

There are a few layouts for the ZVEX SHO boost out there and some show one diode and some show two.... what does the actual ZVEX pedal have and how big a difference is there between the two options? http://4.bp.blogspot.com/_y7gcfRKQFgA/TEwVhhLfVpI/AAAAAAAAANA/Ocs0wgViO_w/s1600/ZVex+SHO+Updated+-+from+Zach+schematic-762360.png http://i210.photobucket.com/albums/bb292/frequencycentral/SHOPCB.gif

[Keppy]

If I remember right, the 2 x 1N4148 configuration was the early production version, which was later switched to a single zener. No difference in sound that I know of, the diodes just protect the MOSFET from overvoltage.