Adding feedback control to EZ Vibe [other mods welcome]

[petemoore]

  Anyone done this?
  It looks like in chorus mode that's the long wire from the 10k off the output of the last phase stage to the input of the first opamp?
  So...if it has feedback is it set low,.. high..?
  It is constructed and boxed so that I can get right to pretty easily most of the signal path section of the board...I'd like to consider whether there is something I might like to add...all comments welcome !!!
   

[Mark Hammer]

Don't bother.  Phasers sound good with feedback because they have fairly defined notches, and accentuating the borders of those notches (which is what the feedback ends up doing) is a pleasing sound.  Uni-vibe equivalents have very ill-defined broad, shallow, notches because they spread the phase shift around more evenly.  Adding feedback to that does nothing.  It's like trying to accentuate the borders of a cloud.  That's why you've NEVER seen a Uni-vibe-like pedal with a feedback control.