Link : Slap Back Echo
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Figure 26 : The echo effect is applied to the highlighted section of the wave file.
Echo, as the name implies, simulates the sound of your voice or instrument coming back to you as if it was bouncing off of a small room wall, the grand canyon, or anywhere in-between.
Figure 27 : Control settings for the Cool Edit 2000 echo effect.
This is a time delay effect with an option of multiple repeats. The echoes, in this example, are bounced back and forth, between the right and left speakers. This is sometimes referred to as ping pong delay, panning delay, or echo bounce.