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Thanks!  I'll have to check this one out.

Did you use a 10KB instead of the 10KC 9mm pot? 

I found the source of the diodes.  I bought these several years ago from UTSource.  They are the rather obsolete 1S1588 diodes.  They could be suspect, but I have used them in other builds.  I tested 10 randomly and found no issues.  i.e. they all read a forward voltage of about .6 - when reversed, they all read "OL" or open circuit.  Is there any way to read them in circuit?  I attempted to and noticed, for the most part, I was getting a .6 forward voltage both ways.  I'll check those solder joints again as well as swapping out the op amp.  I don't have an audio probe, but I'll make one and let you know what I come up with.  Since I have a oscilloscope, I was going to run a 1k sine wave to the input and probe that way.  Not sure if that will tell me anything though.  Thanks again for the suggestions.

The Fat control does work, but the Drive - well it's not really increasing the volume.  It adds a tad bit of gain, but not what you'd expect.  The Level has to be up about 3/4 to get to unity gain.  The SLA does nothing and the internal DIP switch provides not audible change to the sound.  Weird.

Of course I boxed it. and had to unbox it.
I'll unbox it and send the pictures.
DIP switch 1 is off and 2 is on

I did notice a bad solder joint on the ground from the switch board to the main PCB.  I reflow as many solder joints as I can reach with out having to remove the pots.
Also - I had to decrease the resolution.  The form has a 1500k limit.

Thank you so much for looking. 

I'm hoping someone can advise what I do to test and diagnose a problem on my build of The Scream.  All voltages are correct per the document, however the pedal seems to be acting more as a clean boost.  There appears to be no clipping.  The pedal is dead quiet and all functions seem to work except for the Drive and SLR.  The diodes  are installed in the correct directions, but I'm wondering if I installed the LED's the wrong way.  That's the only thing I can think of and was hoping someone could help me diagnose the problem.  Any help would be appreciated.

Thanks

Thank you! 

I was about to source parts for the Pale Horse and Scream and it appears Tayda is out of stock on the 10KC pots.  Has anyone had luck sourcing these elsewhere?  I've been searching, but have had no luck.

Thanks