make / manufacturer:Lexicon, Alesis, Digitech, dbx
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These were left to me by a friend who passed away. He used them in the late 80's - early 90's. I've been able to turn them on but have not officially tested them. All require a power cord or 9-volt power supply. Unfortunately, these were not provided to me so, obviously they are not included.
I have no use for these. $20 each or $100 for all.