Editing Music

I have learned the MAC OS very well with VO but, am encountering a problem. I can not find a software that I can use with VO to edit music to make custom ringtones. I understand the method of creating, moving, so on so forth but can not find a accessible program. I have tried WavePad but, had no luck and wondered if anyone had any ideas or experience with this? If not I'll probably throw Adobe Audition on the Bootcamp and make them using JAWS since that's how I did it before I made the MAC conversion. Thanks