Wasn't sure where else to ask this. So, I have an xbox 360 and will be buying an Airport Express soon for AirTunes/AirPlay and I want to be able to have my surround sound output from both sources at the same time. That way I can play my xbox and/or listen to music without changing sources. My surround sound does have 2 RCA inputs but it would be so much easier to not have to swap input (and I can listen to music and play xbox at the same time). So what do I need to buy in order to have both sources being used at the same time? Tried a Y splitter to combine the source but it just cuts on out, then later found out that it can cause problems anyway.