Sounds like Zone 2 may be what you want. You can turn it on/off regardless of what you're doing with your main zone. You can select an input for Zone 2 independently of the input you select for your main zone. However, AVRs with a powered Zone 2 will take those (2) Zone 2 amps away from your main zone, (ex. turning your main zone from 7.1 to 5.1). I think most AVRs just use pre-outs for their Zone 2, which means you'll need a seperate amp(s) to power your Zone 2 speakers. Still, Zone 2 would give you the most flexibility for your outdoor speakers.