One more question about octave up effects

[smashinator]

Looking at the Tyco Octavia schematic, I understand how the octave up part is generated, but I don't see where the fundamental gets through?  I don't get it on the scrambler schematic either.

I've done a search and read all the old octave threads I could find. Obviously, there's something I'm still missing/just not getting.  Can anyone can explain this, or tell me what to look up that will clear this up for me?

Thanks!

[Pedal love]

Fundamental and other harmonics are passed including sum an difference frequencies and other stuff. Its not a strict either or thing.pl

[smashinator]

Interesting.   I guess I've got some research to do.  

Thanks!

[Pedal love]

You have some great people here to help