Nonlinear vs. chaotic

[Sean Costello]

Paul Perry wrote:

> I am looking for a physical (or electronic! I'm not fussy!) method to delay an
> audio signal, with the delay being strongly frequency dependant, so the elements
> of a noise pulse will spread out timewise... I believe a corrugated tube will
> do this over a narrow frequency range, but I need a full bandwidth audio
> solution...

I recall reading somewhere that several allpass filter stages connected
in series will do this, I believe. By "several" I mean "several hundred"
or some absurd number.  I'll try to find the source later on today.

Sean Costello