What Exactly does the A-B button do?

[Tiyako]

Hello all! Fellow D2 Owners!
I've jsut recieved my D2 not long ago, and now i have a question.
While playing a song, at the bottom of the screen , when u open the "settings" Menu , then in the sub-menu with all the folder boundary , Shuffle , Repeat, Jet Effects, then the last one is called: A-B. What exactly does this A-B do? And How does it work?
Thank You all for your time!

[slip]

basically the a-b option repeat time selection in audio file.for example it will repeat the audio file between 2:00 to 2:10.
it's good for language learning and for musicians.

[Judge]

A-B is a section repeat function. The first click sets point A, the starting point. The second click sets point B, the end point. The D2 then starts loop repeating this section until you click the A-B function again and erase the A and B points. Try it, you'll figure it out quickly.

Link: previous thread with the same question.

[Tiyako]

okok! thx you very much all! for ur time!