i just watched this echo etude by yngwie malmsteen, and i have searched some things and i found out that he uses a volume knob technique ( i got that down) BUT IT COULD NOT FIGURE OUT WHAT DELAY SETTING WAS HE USING. can anybody post the delay setting if they know it? please
Just experiment. He has it repeating once, at about the same volume as the dry signal, and match the time to the speed of your playing.

Some pedals have tap tempo, where you can tap your foot to adjust the time.