Highnote is really simple. It allows you to speed up or slow down the tempo of a track loaded from your Music Library and change it’s pitch too (by semi tones). The processing quality is good.. It is really hard to rate an App... For example, in this category, I use to test bigger Apps, which comes with a lot of features... Most of the time my rating depends on the App Store description or bugs (if I find them...). Some categories of Apps need extra features: sharing, recording, Midi, ... features. So, Highnote does very well what it says it does... A little Super App!