Hi,
To gain full and seperate control of the outside speakers you'll need a Beolink Passive which is basically an amplifier with a IR sensor.
You need to connect the Passive via Masterlink to your BS9000. You then connect the speakers to the passive. You'll gain full control of the BS9000 plus you can then operate the volume/tone separate to the main system.
It works well; I have 2 passives - one for the bathroom and one for the outside speakers. The passives are located in the roof with the IR sensors the only things visible.
Where in Australia are you located.
Peter