380-400ms, 2-3 repeats.. mix, around 10 o'clock.
Wala na kong DD-3, so I can't help you with the knob positions. Tanchahin mo na lang.
Generally, ang delay setting na pwede for lead, rhythm, silent passages, etc.. yung sapat lang yung delay time, repeats, at volume para 'kumapal' yung tunog mo, pero hindi gumulo. Kasi yung iba, pag nagset ng delay, nasasapawan na yung other notes nila - tuloy tunog off-tempo.
Yung setting na binigay ko sa taas, yun ang pinaka-common kong makitang delay setting for most guitarists.