Hi all, Just curious--on an analog circuit one can send a signal output back into it's own input. It seems that Csound is perhaps locked into a variable declaration style that would make simulating this impossible--i.e. one can't declare an output as an input unless the output has been previously declared. I was thinking that global variables and some trickery with 'init' might somehow make this possible, but maybe someone knows a better way to proceed. I recall as far as I remember that the DX7 emulation floating around uses phase modulation tricks and I think also uses global variables to simulate the DX7 algorithms that had feedback loops, but alas my 'Csound Book' is buried in a book box somewhere among about 20 boxes since rearranging our garage, so I can't confirm....or I should say, I don't want to go digging THAT mch! Anyway, has anyone tried to play around with chaotic signal paths by implementing 'feedback loops'? Best, Aaron Krister Johnson