Ringtone Maker free version(contain ads) is a free android application to cut MP3/AAC/WAV/AMR audio files and create ringtones, alarms, or notifications from them.
How to use is very easy:
1. This apps is automatically detect audio files from your device. Choose one audio file from the list to edit or record new.
2. set the pointer to the part of sound wave that you need to cut
3. save it