Low Rider Muted Octave Down - Help?

[GermanCdn]

All right, so I'm through the 12 builds of Christmas (12 pedals in 12 days, my wife thinks I need help), and I'm into the debugging stage.  Got everything working the way it should, except for my Low Rider.  

Clean signal and Octave up work as expected, but both octave down sound very muted (like you rolled the tone control all the way down on your guitar), and don't come through like they should (works well to thicken up single coils, but that's not really what I was going for, nor is it the function of the pedal).

Anyway, working my way through the path to try and find the problem, but wondering if anyone else has had this problem and what might be the source?  Given the number of components to trace, any help would be greatly appreciated.

Thumbs up to madbean, great boards and great sounding projects.  LOVE the Double Flush.  Sold three of my old trem pedals the day after I finished it.