Even a year after the release of 10.4 almost no sequencers natively support AUNetReceive. There are things like Bidule that support it and can be used as a VST plugin, but that is even clunkier and more expensive.
Wormhole is great for sending a few audio tracks over Ethernet. I lost the use of an audio card when I switched my old computer from OS 9 to X. Wormhole was far cheaper than a new audio card, and it works with very low latency. I've never had a problem, but I have never sent more than 2 stereo audio channels at once.