Just to be clear, the apps and the bluetooth speaker have nothing to do with each other. You pair with a speaker, and by doing so it routes all sound from your phone/tablet to the speaker (regardless of what app you are using). This is not to say you aren't having the problem you describe, but just trying to help you on how you go about solving it. The first thing to try is to close both apps entirely (so they are not running in the background) and reboot your phone/tablet. It is possible the particular sound service on your Android that is being called to play sounds from the BlueRail/E-Z App has stopped running and needs to be restarted. There is a good chance this will solve the problem. If it doesn't, you should google the specific name of your Android device followed by "no sound" and see if you see any recommendations.