Boss introduced the DD-3 in Japan as a simpler, single-chip successor to the DD-2, keeping the same 12-bit converter but dropping the modulation circuit.
By 1989 assembly moved to Taiwan; the circuit board layout changed and the input buffer was revised, which some players say softened the initial attack.
Radiohead's Ed O'Brien ran one in front of his AC30 for the repeating eighths on OK Computer, while My Bloody Valentine techs kept several on hand for Kevin Shields' reverse-delay experiments.