[2020] Silent sounds and voices

This sounds like a volume slider in your audio options is set to a value other than 100.  Please double-check that.  If that doesn't work then check that your Windows audio volume for Warframe is set to an acceptable loudness.  This can be found in your system tray while the game is running.  Another thing to check would be to make sure your system is using the proper audio sound card.  This can be seen in the Audio Options as well (Audio Output Device).