Hi, and welcome to the site.
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What I THINK I need is a way to map the hosts microphones into one group to be sent to the softphone. And then another group that contains the callers audio as well as the hosts into one device to then be sent to ustream.tv
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That's pretty much it. Or something like it.
In the "old days", when everything was wired, audio was controlled by mixer boards. I've been re-watching my Frasier DVDs lately, and it often shows Roz and Frasier in the control booth at the fictional KACL radio station. Roz sits at a desk that's essentially just a great big mixer board. It's the same concept here.
These days, much of this is done through software, especially for low-budget web-based broadcasting.
It's really just a matter of "wiring" everything (either with actual wires, or with virtual connections).
Another benefit of mixers is you can control and normalize volume for all callers and for all show personalities. That's also done in software now (or can be), so don't overlook that. Maintaining quality levels is just as important as everything else. A poor and uneven loudness volume between callers is a typical hallmark of amateur operations.