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In a message dated 07/29/2001 10:57:53 AM, matthias@grob.org writes: >well, there are two totally distinct effects: > >- When there is enough interference of the speaker field into the >pickup, you get direct magnetic feedback (independent of the strings) >and its very quick and rude. > >-When you create a mechanical contact between speaker cabinet and >guitar body, the strings receiver the vibrations and feedback builds >slower and is controllable by tuning and damping strings. right! dt / s-c