In addition to having the best stand-alone "slow-downer" on the market, Song Surgeon also offers the only web-based or online service to adjust pitch or key and tempo. The system is very simple and easy to use and supports most common file formats. Here are the steps to use this service:
Song Surgeon uses a state-of-the-art sound engine to accomplish pitch and tempo change. This FREE service uses only one algorithm for pitch and tempo change and of lower quality. The desktop application uses two different algorithms to accomplish unmatched sound quality from pitch/key and tempo change. When it's done you won't know file was the original file and which file was changed.