Well, what can one say. It does in fact slow down music without changing the pitch. The audio quality is good.
Beyond that though, the user interface looks like a dogs breakfast. There is no benefit to the extra screen space on the iPad - it just blows up the ugly buttons and sliders. It doesnt even have a waveform view! I find that an astounding omission considering that all of the competitors on iOS and the desktop have one. As a result, ASD makes it much harder to find and pinpoint a loop than the competition.
Its also lacking in features at the price point. Do your research folks - there are actually a few "amazing" slow downer music apps for iOS. Do yourself a favour and search the store for a few before defaulting to this one because you used the desktop one ages ago.
Supah Starr about Amazing Slow Downer, v3.6.0