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Boomerang Boomerang Version 2.0 Line 6 DL-4 Line6 Dela Pro Repeater Repeater MK2 Echoplex Echoplex Digital Pro + Loop IV Aurisis software upgrade Digitech RDS8000 Lexicon Jamman DIgitech Giga Delay DIgitech Loop Station Boss RC-20 Loop Station Boss RC-20XL Loop Station Original tube/tape Echoplex with the erase heads disengaged for sound on sound looping (used in 1982 and I'm sure, earlier) Roland RE 501 Chorus echo with the same approach first primitive digital delays with infinite repeat...........a whole slew of them. Cassette and Reel to Reel Tape decks with circular tape loops spliced in. Teac even made short tape loop cassettes commercially that we used.