1. Click the Apple Menu and select Control Panel.
2. Select the Monitors & Sound control panel from the pop-up list.
3. Click the Sound button at the top of the screen, and choose Sound Out.
4. Try each the three settings for Sound Output Quality in order: 11.025kHz; 22.050kHz; and 44.100kHz.
5. Run Riven after each new setting and listen for sound quality improvement.