Good Feedback.

[Norbert Brunhuber <brun@xxxxxxxxxxxxxxxxxxxxxxxx>]

  With all this talk about avoiding feedback, has anyone tried to use 
feedback productively.  I mean, guitarists in rock and roll will get a 
nice smooth feedback from their Marshall amps that sounds great.  I can 
sometimes get this but it is totally under control.  And more often than 
not, the feedback is a piercing, sharp whistle rather than a smooth 
progressive sound.  (Check the ending to "I, Alone" by Live to get a 
perfect example of long, drawn out guitar feedback.)

--Norbert