Network problems or system settings errors. DJ Duoduo is a DJ music box produced by the Ringtone Duoduo team. The reason why you cannot select the sound quality when downloading songs from DJ Duoduo is because of network problems or system setting errors. You can reconnect to the network or set up the system. DJ Duoduo is China's exquisite DJ application, covering the three major platforms of Android, Apple and PC. It contains high-quality DJ dance music to ensure users' listening experience.