Just got back from a trip and checked out the speaker set up. No speaker switch in the garage. Inside cabin plays outside with the surround sound.
We ended up taking a separate blu-ray player and just playing the sound through the TV rather than having to deal with fade and outside speakers. We did purchase a speaker switch at Radio Shack and will be installing that so that we can select which speakers are playing at any given time. We also have to re-wire the built in entertainment system, they left it wired for a Class A or C when it was installed, so it will not play DVDs since we cannot set the parking brake! Fifth wheels do not have parking brakes. How frustrating, but we are working through the issues one at a time. And we do love the layout and comfort of this platform, not to mention the ease of taking alone our motorcycle.