Raindrops funktioniert nicht

diese App is a simple player that keeps playing rain sound, with visual effects of raindrop.  While listening to the sound, you can use some other app (if sound is not used in the app). - $4. - Allows you to set a timer for up to 12 hours. * Pausing may not work properly when the device is locked.  After the app goes into background, it continues to play rain sound automatically.  The rain visual effects vary depends on play-pause status.  To cancel the timer, control the dial to 0 value, and press "CANCEL".  The rain falls or stops when you play or pause the player.  When sleep timer is set, the app plays sound automatically.  Press timer button and control the dial and press "SET".  To enjoy rain view without buttons, tap anywhere except for buttons on the screen.  Rain type can be chosen from "Heavy", "Light", "Hood".  Enjoy feelings of "controlling rain".  Sleep timer function can be used for your sleep.  Please use the app when you want to be relaxed, or focus on work.  In addition, the lightness of the sky gradually changes by the time this app is used.