Video by Casio Music Gear via YouTube
Source
In this video we’ll show you how to get started using Chordana Play with your Casiotone portable keyboards including the CT-S200, CT-S300 and LK-250. Casio’s Chordana Play is a free application that will help you learn to play, available for iOS and Android.
For more information visit:
https://www.casiomusicgear.com/chordana/play