A free app for Android, by Smart Mobile Tools.

With Music Editor: Ringtone maker & MP3 Audio cutter, you can make music with the best tools. You can use it for editing, cutting, and converting. It is easy to use and has many powerful tools. It supports MP3, AAC, WAV, M4A, AMR, and more. You can edit any song or sound. You can record and share your music. It has a built-in player. You can add effects and change the pitch. It supports the split song and the delete section. You can use it for editing your ID3 tags. You can change the volume and the sound. You can mute the sound.