Have you checked all the "Volume Levels"?
Double-click the "speaker" icon in the System Tray (next to the clock)
Make sure all is on MAX and is not muted... You may need to click "Options->Properties" and tick all the "Volume Controls"
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Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.