jargon
"Don Pearce"
And make no mistake, the feedback the OP was asking about was the loud
howl you get when you turn the PA up too far.
** The wording of his massively ambiguous post does not suggest that.
Effects units that delay an audio signal become " reverb " units with the
aid of some feedback from output to input.
That is the "jargon" used.
.... Phil
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