http://alteclansingunofficial.nlenet...1620A-Data.pdf
Looks like it just turns the volume down a tad if it senses feedback, probably intended for voice only. Doesn't sound useful for Hi-Fi or Pro use. There are a number of units that EQ out feedback, but most making the mistake of not "ringing out" the system and locking them down.
Behringer Feedback Destroyer Pro FBQ2496 - Feedback FBQ2496 B&H
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