In addition to listening to music the same way as most users (by playlist, shuffle, ,,,), I use my music players (recorders) for 2 addtional purposes: 1- Learning languages (English, French, Spanish, Italian). As part of language learning, I need to listen and repeat the same section (A-B segment) of reading/singing voice (vocal) to improve (and perfect) the pronounciation. 2- Repeatly listen to a few measures in a instrumental/vocal songs in order to find/write out notes and chords in songs (mp3, flac, wma). This helps me playing piano accompaniment (and may be sing) for these songs at later time. As such the A-B repeat function is very important. Currently I still have to use the old and trustworthy Sony minidisc player and the VLC program in my Windows laptopn to accomplish the above tasks. Definitely this feature will attract many Android owners. It will give Poweramp a definite advantage over its competitors.