From Analogman:

The Boss DD-3 is made with the same technology as the DD-2 which was the first compact stomp-box digital delay pedal. Introduced in 1982 using the same chip as the awesome rack mount SDE-3000, the DD-2 was very expensive. After a few years it was renamed DD-3 and lowered in price when the memory chips got cheaper. They stopped using the big SDE-3000 chip about when they moved production out of Japan in the 80s. They are very warm and natural sounding for a digital pedal, as they use the same compressor/expandor chips as an analog delay, and redo the echoes each repeat unlike the newer pedals which just spit out the same bit samples for each echo with a sterile sound. Our HIGH CUT mod really makes this pedal sound great, as it cuts each repeat more and more, like an analog delay. If you plug something into the DIRECT OUT on the DD3, the main output will be only the delayed signal. This can be very useful. If you don't need the features of the DD-6 (long delay time, stereo inputs, tap tempo, reverse mode) or if you want the ultimate warm tone with nearly one second of delay, the DD-3 with our high cut mod is the way to go

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