Acoustica MP3 Audio Mixer
is a tool that lets you edit and customize your MP3 files. With this software, you can cut and paste sounds, as well as mix, dub, and record your files. You can also fade the playback rate of each sound and change the volume of your files. All of these features lend themselves to easily creating ringtones.
Files can be imported as MP3, WAV, or WMA and can be exported as RealAudio G2, MP3 or WMA files.
This is a trial version that expires after 7 days.