If you want to use zone 2 to feed both the great room and the outside speakers but would not ever need to feed the two different sources, you could use a switch box instead of a simple splitter. Depending on your needs, the switch box may need to allow for A+B operating as well as A or B operation, but it would let you feed both the outside speakers and the great room from zone 2 without having to have both zones on at once (assuming having one zone fed from the tape output doesn't work for whatever reason). This switching could even take place at the amplifier - my old Parasound amp (HCA-800 Mk. II, used for surround back detail) had A and B speaker outputs that allowed for A, B, or A+B operation, and many receivers have this as well - you could use an old receiver as amp for those zones.