feedback               
                                      
                            
                            
                                          
 feedback is  for  making  the  process a 
 whole lot  more  messy,  to  introduce a 
 fractal  in the  spice mix...  things or 
 populations of things start to  be  self 
        referential or self eating        
 (autovore...) or spiraling in or  out... 
                                          
 in the  sixties they did research in the 
 jungle  and in  the  sea and they  found 
 that  feedback does not give rise to  an 
 equilibrium.  they were trying to  prove 
 that nature  is a  tame beast. but she's 
                   not!                   
 this may  hold  true  out  there...  but 
 maybe not in signal wizardry?  depending 
 on  your  technique,  you  might  easily 
             find recurrences.