'(<a href="http://www.j-archive.com/media/2009-05-07_J_02.wmv">Jimmy of the Clue Crew holds a microphone to a loudspeaker.</a>)  An audio signal returned to its source as an input & retransmitted gives you this loud sound'
feedback
BACK TO SCHOOL: An audio signal returned to its source as an input & retransmitted gives you this loud sound
An audio signal returned to its source as an input & retransmitted gives you this loud sound
An audio signal returned to its source as an input & retransmitted gives you this loud sound
"BACK" TO SCHOOL
feedback
"BACK" TO SCHOOL