I have a friend who would like to install speakers in 5 areas of his home. We'd like to have volume controls in each; 4 indoor, 1 outdoor location. Do we need to put a speaker selector switch outboard of the receiver or do the volume controls address the impedance issues that come with running multiple speakers at the same time? What controls have members of this forum found to be good for this kind of installation? The receiver, speakers, etc., are all open for discussion, as nothing has been purchased yet. I'd appreciate input from anyone who has done this kind of set-up, as well as everybody else with thoughts on this subject.