Balanced Audio Technology REX DAX Owner's Manual page 11

2.3. Turn on the REX DAC and plug it into the USB port of your computer.
2.3. Open JRiver Media Center. Choose Player on the top toolbar. Scroll down to Playback
options and click on it. A new window will open. Choose Audio on the left pane and Audio
Device on the right (see picture below)
Click on down arrow and choose AKDesign Audio (ASIO) click OK.
Done