[OpenIndiana-discuss] audio control problem

[Apostolos Syropoulos]

Hello,
I have a machine whose audio device is properly recognized by the system,I have tried to play sounds with audioplay using the command
$ audioplay file_example_WAV_10MG.wav

And I could hear the sound. I downloaded the file from the following URL:

https://file-examples.com/wp-content/storage/2017/11/file_example_WAV_10MG.wav

The problem is that I hear nothing when I watch a video in youtube. 
In addition, I have to say that the audio utility of the mate controlcenter  shows no output audio device.  What can I do to make theaudio control see the audio device?
Thanks in advance for any help and/or assistance.
Regards,
Apostolos

----------------------Apostolos Syropoulos
Xanthi, Greece