The THX Tune-up was released a couple of days ago and is a free download from the App Store until Feb. 4th. After that, it's $1.99. The app is kinda cool for checking and making some basic tweaks to your system but is best used via Lightning Port to HDMI cable (iPhone 5, etc) as opposed to streaming to the AppleTV. For one, you can't check 5.1 audio wirelessly and two, the pq settings are best checked thru a cable connection. It should be available for Android systems in a couple of months. Nice for checking settings on the fly but that's about it.
