I made a live piece with csound and a slow feedback-eliminator
instrument, performed with long aluminum tubes as resonators and
Ingrid Lode on vocals.
There are also 2 partikkel instruments used in the piece, but the main
focus is on the feedback instrument.

The piece and a simplified version of the instrument can be found at
http://oeyvind.teks.no/results/results.htm

A more elaborate version of the instrument can be found in the
ImproSculpt CVS at
http://improsculpt.cvs.sourceforge.net/improsculpt/ImproSculpt4/

Hope you find it interesting.
Oeyvind