If you are using HDMI output from the V box then the scart output would be disabled.
So your DVD player is connected to the TV for vision and direct to the Albi for sound, yet the V box is connected only to the TV with no direct sound connection to the Albi
Is the socket from the TV that you have connected the Albi to actually capable of sound output, or is it ini fact for input only? If the TV output will provide sound to the Albi then you should be able to use that same output for both V or DVD boxes without change of selection on the Albi.