Once a sound has been put into a Digital Format, editing that sound means manipulating the numbers which represent that sound. We manipulate numbers using formulas, or “algorhythms.”
One of the first uses of Digital Audio in “live” music was the use of “Samplers.” Samplers allow musicians to “trigger” a digital audio sample from a keyboard. Since samples use a tremendous amount of memory, one of the first editing tools in Digital Audio was “looping.”
“Looping” means that when a sample ends it goes back to the beginning and plays again. That way a 1/2 second sample can last for as long as the musician holds his/ her hand on the keyboard.
The “trick” to looping is to make the point at which the beginning and end point of the sample join “invisible.” A good "loop" should have a "natural" sound, without an obvious "juction" point between the loops.
Where a wave form is joined back to itself is called the “beginning loop point” and the “ending loop point.” Many Digital editors now try to find the best “loop points” for you.