DOD 680 Analog Delay schematic question

[coldfire]

Hey Guys

     I read this forum quite a bit but haven't posted yet. Here is the cry for help.

Has anyone worked on a DOD 680 delay or looked at the schematic?
This is the one that is floating around on the web.




The question is the area circled in red. It looks like the +/- inputs should be swapped. Am I correct on this
or am I missing something?

Any input would be appreciated.

Thanks

Coldfire

[pinkjimiphoton]

just a guess? maybe they're using the feedback for some noise reduction.
wondering if reversing those two connections may fix the polarity issue some dod's seemed to have..
back in the day, they'd often not play well with other company's pedals...
i believe it's something about the phase getting reversed from the input signal at some (or many) points thru the circuit.

[coldfire]

Interesting point. Even with that, the circuit does not seem right.

I'm thinking their intent was to mix the input signal with some of the delayed signal.

If it were a mixer the op amp inputs would have to be swapped.