EFY-6 Feedback Loop Help Needed...

[spectreman]

I'm trying to add a feedback loop to a EFY-6 layout (see attached).

The usual approach of Effect Output -> Effect Input feedback loop does not seem to work on this circuit.

I've been poking around the thing with an alligator clip, and I have found that if do Effect Output -> Octave2/3, I get a little distortion/boost, but not the feedback screeching I'm looking for.

Does anyone have any ideas?  I'll do some more experimenting,  but if there are any suggestions or knowledge about how to incorporate a feedback loop into this circuit, I'm all ears!