A delay line, in which the delay is accomplished electronically, via an analog/digital and digital/analog conversion.
"I wanted to let you know that I received my CDs and am very happy will the sound and the service I received. Back in the late 60's, when I was a young boy, my family used to spend Christmas time in Sun Valley, Idaho where we often past the time listening to the Lettermen, particularly the album "Spring." I had wanted to give my parents the CD ..."