- Download and install Goldwave
- Import your music to the tool.
- Cut the music as per your wish. The length of the audio should not exceed 40seconds.
- Save the audio in wav or mp3 format.
- Go to Batch processing in Goldwave and convert the saved audio in to m4a.
- Then rename the m4a file to m4r.
- Import the file to your iTunes library and sync to your device.