This is a nice idea, but hopefully will be improved. Response times to the keying action, sliders etc. Seem very slow on my Note 10.1 which makes it difficult to get any feeling you are actually controlling it. Not only that, but on Gen mode, the letters, sound and dits and dahs go out of sync, which renders it useless as a learning tool. The 'Temp' slider which controls the speed would be nice graduated in WPM as most would set speed in words per minute. On exit, it goes to an annoying game ad, which then crashes the app. When you restart, it just goes to a blank screen. Have to uninstall until these issues are fixed. Restoring a 1944 version of one of these keys at the moment, so will be interested to see any future improvements.