Need some assistance with a loopback configuration (willing to pay)

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I need to setup a configuration that will allow me to route audio between two virtual devices.  For example, one application using ALSA will use virtual device A's input and output, and another will use virtual device B's.  The output from A will route to the input of B, and the input of A to the output of B.

So far, I've tried:

-Using snd_dummy and JACK, but there seem to be some quirks and I haven't gotten anything to work correctly.
-snd_aloop, but I haven't gotten very far as it keeps segfaulting.  I've seen other people with this same problem.

I assume one of the following would work?

-Getting snd_dummy to work correctly and using some clever devices in .asoundrc
-Using JACK correctly
-Creating a custom ALSA module

The machine I'm trying to do this on doesn't have an actual hardware sound card.  If you can help, please email me directly.  I'm willing to pay for a working configuration.  I apologize in advance if bounties/paid assistance is not allowed in this list - I didn't see anything stating otherwise.
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