Here's my dilemna: I have an RP-91 and love DVD-A. However, there are several SACDs I'd like to own as well so I'm interested in getting a Sony SACD player. The problem is my receiver only has one set of 5.1 inputs. Is there a switch box that will allow me to hook up two 5.1 output devices to a receiver with one set of 5.1 inputs? Thanks in advance.