There are many tools to modify audio, but many of them are only focused on professional users and require a high amount of knowledge in order to be used properly.
Modify the tempo of any song
AudioRetoucher simplifies several processes that will allow the user to modify the pitch, tempo, and speed (without affecting one another) in real-time, from a very attractive interface and without requiring any knowledge of how to handle music post-production tools.
Furthermore, the application will allow the user to calculate the beats per minute (by means of a Tap Tempo controller) and modify the equalization (through control faders), as well as amplifying the low and high frequencies with the corresponding filters. The program is compatible with MP3, WAV and WMA files, and it allows you to export the processed files to MP3.
AudioRetoucher can be very useful for DJs and singers, because it can calculate the speed of a track or change the pitch in real-time, making life much easier.