The sound is heard from the mobile device when I select USB as the source.
IMPORTANT: This article applies only to specific products and/or operating systems. Check Applicable Products and Categories for details.
The sound output may come out from the digital media player or mobile device if playback is started on the application before connecting it to the USB port. Close the application and try connecting the device again. If this does not resolve the issue, refer to the operating instructions of the digital media player or mobile device.
NOTE: Updating the firmware of the digital media player or mobile device may improve functionality.