I realize that what I have done is not truly circuit bending, but I felt that it was interesting and
was the closest related topic to my hacking.
Tools I have used:
Precission Screw drivers: flat,philips, torx, triwing, and allen
knife or wire cutter
package of various resitors
varialbe resistors ( potentiometers)
Here are some links that may be useful for this type of hacking.
Actual Circuit bending
Passsive Audio Filtering
Contact NewAgeTechnoHippie at gmail for question or comments