70's EH Deluxe Octave Multiplexer working right?

[Processaurus]

Thanks very much for the boscorelli and dbx links!  Good stuff...  I'll have spend some time looking over them. 

The DC offset thing sounds like its an issue with the different type of octave synthesis than this EH pedal uses, this is the phase switching without a dc difference in the two phases, like the first diagram.  The Boss uses the DC offset type, like the second diagram.  I have one of those apart right now, maybe I'll see what it sounds like without the filtering stage, and how clean they do the switching transition.