Please read below as detailed here:
Ensure you have speakers and/or headphones plugged into the green audio port on the back of the chassis, as well as the front headphone port on the front of the chassis.
On the Realtek control panel, click the Mixer tab.
Click the Toolbox icon (it looks like a wench) .
On the Playback section, select the Enable playback multi-streaming checkbox and click OK to return to the Mixer tab of the Realtek control panel.
On the Playback section of the Mixer tab, Select Realtek HD Audio output from the drop-down list.
Start the audio playback application that you would like to use with the rear panel output.
On the Realtek control panel, click the Mixer tab.
On the Playback section of the Mixer tab, Select Realtek HD Audio 2nd output from the drop-down list.
Start the other audio playback application. This application will stream the audio to the front panel output.
NOTE: The internal speaker will be disabled if multi-streaming audio is enabled.
If that does not work, while the drivers are installed please try changing the default audio playback device. You can do that by clicking on the speaker icon in your notification tray, then clicking mixer, then click the icon above the master sound slider. There you should be able to change the default audio playback device.