Hi all, i was wondering if it is possible to mix different audio files and export them into an mp3 file for the end user to download to his computer.

Actually, I know it can be done because they do it in various sites (http://aviary.com/tools/Myna , http://www.looplabs.com/ , http://www.audiotool.com/ , http://www.remixgalaxy.com/), I just need help on how to do it.

I have the mixing part pretty much covered. My problem is with exporting the file to an mp3. I imagine that some external progamming language might be required, but I couldn't find an answer on Google... Php is my prefered language, but I'm willing to learn another one if it's not possible with PHP.

Any ideas?

Thanks!!