I have the pair and go one 5 way "auto" one from ebuyer...
http://www.ebuyer.com/product/132435
... to swtich between my V+ and my Samsung HT-X30R. This acts the same as yours and does not auto switch.I have tried with and without an external PSU as recommended on the reviews section on ebuyer. think i'm going to have to get a remote controlled one instead.