Looplabs is a premier audio mixing program built for the professional DJs that comes with advanced multi-channel presets, MP3 sampling, remixing, and triggering. It supports up to 32 different channels giving you an exceptional multi-channel mixing experience, while its sequencing, and song composing capabilities are simply amazing too.
You can even output audio to WAV/MP3 files, and create/output ring tones too. With stereo-effects processing, and drum and rhythm pattern machine, crossfading effects and much more, the Looplabs is one hell of a music mixing application.
It has cross platform compatibility, so both MAC users as well as PC users can make use of the Looplabs audio mixing software. You can download Looplabs (courtesy CRASHMEDIA) by visiting this link.
You may also be interested in tools to perform track mixing for Podcasters.
Here another comprehensive set of free audio mixing programs that you may be interested in looking at.