Soundtrack pro offers comprehensive editing and mixing to users of Final Cut. Too bad it's mostly useless. There are so many bugs in this software, that it is hard to comprehend any company having any self-respect to release such a piece of garbage. Sudden crashes, corrupt projects that won't open, and weird stutter/clock issues on playback. I have experienced every flaw that the previous review has listed, and then some. One day, hopefully, it will perform like it should. And then it will be great. But it's not great now. It's useless for anything that has more than 50 audio clips, and compared to how the same project performs in either Logic or Final Cut, there is no excuse. I am done wasting my time with this extremely disappointing application. And the new update hasn't changed much, as far as I can tell. It's still hogging twice as much CPU as other apps with the same playlist. FYI, I'm a huge Apple fan. Logic Pro and Final Cut Pro are how I make my living, and I love both of them. But Soundtrack Pro is not pro. It's beta. Boo.