| sounds like some professional work that you want to do with it. Maybe you should think of Airport Express? The problem is, that you can't use different sound-plugs at the same time. I have a bluetooth headset and I can't have the sound on my internal speakers, my audio out and the bluetooth headset at the same time. So, if you want to have a low-cost solution, the jack doubler is the only way. In worst case you will need an adapter for your harman kardon plug..
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iBook 600; 12''; 640mb; 8mb Rage; DVD-CDRW-Combo, 20GB
P4 1.6; 2x80GB Raid1 (file-server)
tiBook 1Ghz, Superdrive, 768MB, 64mb 9000, 60GB
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