I currently have a Motorola phone, previously a Samsung and this option checked does not work on any phone. The dudu os application has no error, only quiet tts voices from. There is an option to adjust them, but they are still quiet, they could be a little louder. I compare it to the FM radio app, they could be as loud as the FM radio app, then you could adjust them. Right now you have to set the FM radio to 3 and the tts voices from google to 9, then you can hear them. This is too small an adjustment. No matter what software version, it always happens dudu7.