Some reviews said it doesn't work without a Xkey device. I got it anyways just to test, and my Korg Nonokey 2 midi keyboard worked. You have to click on "Audio and MIDI Settings" and make sure the blue circle next to your keyboard on "active MIDI inputs" is checked. Once you have it, it works great! A bit of a delay between clicking the note and playing it, but it's managable.

If you own a Xkey keyboard and want a simple, easy way to just play it, this works well. The Grand Piano sound has a crisp, clean sound that sounds decent through small laptop speakers if you’re just trying to play something quickly (there are a few other instruments included). It’s free and knows all the buttons on the keyboard so it’s easy to recommend.

This app is magnificent ! I absolutely love the threme background! Wish there were more thremes ! THANKS

"Requires CME Xkey keyboard to get maxium user experience". NO, it's required to get any experience at all. I thought this was just a simple free piano app. It is not. Without owning one of their keyboards, you are prompted to enter in your email address so they can tell you how to purchase one. Futher more, once the user begins typing in the text box, the app crashes. Without an Xkey keyboard, this app is non-functional.