SnakeLoops lets you slow down and loop difficult parts in video or audio files, so you can practice from them effortlessly. It has also a pitch shifter function.
You will learn much quicker if you take it slow at first and really try to feel it. This application is meant for anybody who wants to start making fast progress in the quest for mastering the favorite skill. Try the app and see for yourself just how much it can make your practicing enjoyable! You will be better motivated when you see fast progress.