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  • An oscillation of a frequency that reaches sufficient levels in a continuous path, electronic or acoustic, to be self sustaining and cyclical. The annoying tone (at any frequency) that’s heard when a microphone is turned up too high or when the tape play controls are turned up when recording on a single tape deck whose inputs and outputs are plugged into the same mixer. If feedback is left unattended, it will damage and/or destroy system components (usually the speakers first).
    Source: Church Audio & Acoustics Glossary
  • information passing from an effector to a receptor, as a signal indicating the action performed by an effector
    Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby

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