(1) There is an option of enabling or disabling Audio (sound) function in the Setup page of terminal. Please enable the sound function of those terminals which will be running audio applications, save the change and then connect to the Host PC again.
(2) Check the audio devices on the host PC. Open “Control Panel” > “Sounds” > “Sound Playback”, if you see that the default device is NetPoint Virtual Audio, this means the Audio device is not properly installed. Please reinstall NetPoint.