I have just completed my build of an OD2.
It is a standard build except
The clipping section is MOSFET.
The boost is MOSFET.
The overdrive sounds wonderful. Really just what I was hoping for.
However the boost section doesn't make a sound. As a matter of fact, the sound is so dead I am pretty sure there is a break in there somewhere. This is true whether or not the overdrive is on or not. I have looked for a schematic so I can trace it, but I don't seem to have found one.
So I guess I am down to posting pictures and hope that someone sees something obvious. I didn't see anything by comparing to the pictures in the intructions, but it wouldn't be the first time I missed something by trusting my eyes.