Myna's horizontal track-over-track layout should be familiar to users of audio tools like CoolEdit or FruityLoops, but it's pretty easy to pick up on, too. Hit the Snap to Grid button, set your beats per minute, and arranging audio clips from your own files, from a microphone, or Myna's sample libraries is just a matter of putting the pieces in place.
Poke around some more, and you'll find tools for volume adjustment, gain control, reverb and flanger effects, and a few other neat effects. It's not quite a multi-track Audacity, but for something you open free in your browser, you'll probably be seriously impressed at how much Myna has to offer. - Lifehacker