You can add beats on any music with Sony Smart Watch.
【How to use】
When you download the app on your smartphone, it is also displayed to Smart Watch.
Then, start the app on both the smartphone and Smart Watch.
Rhythm begins when you select one of the "BEATSOUND" and shake your arm with Smart Watch.
Enjoy overlapping rhythm sound with melody in other apps.
In addition, you can adjust the sensitivity and volume from setting button at the top right.
Smart Watch2 SW2