Tape Echo / Dub Mixing Tips & Tricks. Play the echo… This is one of the most fun dub techniques. It requires an echo with a movable replay head like the HH Slider Echo shown here. Moving the replay head allows you to play repeats and quickly change the echo rhythms. While the Slider Echo without a doubt provides the slickest and smoothest experience and is the most playable of this type of echo, the more famous and easily found (in the US) Echoplex and (in Europe) Dynacord Echocord Super 76 and