A great tool is FL Studio Fruity Slicer, with which you can create regions or Slices which automatically places a note, thus production is unlimited ringtones or drumkits.

The purpose of Fruity Slicer is that loading sound, You can sort the way you want.

On this occasion I will talk about the variable loops, or loops from, they can create with the tool Fruity Slicer; as a simple melody, in this case a guitar loop called FXGUIT-4, You can create completely different melodies to original, occupying the same sound.

Let's take a look at the original version:

In this article we explain the content of the Ski-HipHop.com downloads; Databases rap, bases for battles, loops hip hop, Sound Library.

A little explanation to answer all your questions.

Fruity Slicer
Fruity Slicer provides the regions and created, Some melodies may be in 2 the 4 beats, sound depends on the duration of calculating the necessary beats, can save the complete sample but has the option to save each region separately. Each region has a default note, allowing you to create a melody [...]

I have heard and read many beatmakers and producers say they got a loop, others who took a sample, but in theory is the same, the difference between these 2 are involved in as, editing:
Loop is defined as the audio is repeated again and again thus creating a “soil” almost ready [...]