Audio Player improvements

[Raptor_sl]

using Google Translate..

I listen to a lot of podcasts and audiobooks while playing and I am missing some features for an audio player. For example:
1. need to add different playback speeds - 1.5, 1.75, 2.00
2. need to add a scrollbar for large audiofiles so that you don't have to listen to the track from the beginning every time