Asus USB-BT211 - Manual (Page 21)

16 Chapter 3: Bluetooth XP Suite
Audio
The Audio page allows you to configure the settings for the Advanced Audio
Distribution Profile (A2DP).
Switch default audio card when Handsfree connects
Tick this box to switch to the handsfree device.
Ask me if the default audio card should be switched for Handsfree audio
Tick this box if you want Bluetooth XP Suite to ask you if the default audio card
should be switched to the handsfree device.
Switch default audio card when Stereo Audio connects
Tick this box to switch to the stereo audio device.
Ask me if the default audio card should be switched for Stereo Audio
Tick this box if you want Bluetooth XP Suite to ask you if the default audio card
should be switched to the stereo audio device.