Nope. Nothing to program.

Either of you want to build one for me? Maybe you could build two Kayak, and I could buy one. I only need two inputs. FRS and Computer, so the second priority switch would be unecessary. I also need it to switch a 12v+ power source to switch the head unit to AUX. I'm suddenly worried I would screw it up.

Looking at the priority switch circuit again, would it be possible to use both sides of the 7141-2B instead of using the second 7141-2A?

One's normally open, the other is normally closed, so I don't see how you could get away with using both parts of either one. There is a single circuit version of each but experience has taught me that they aren't much cheaper and you usually fry one.

I'm not sure when if ever I'll get around to building my version, maybe this spring, but if you haven't built yours by then I would be happy to cobble something up for you.

How about a parts list with sources? I'll get to work on it and build one for you.

Thanks for the offer but I'll probably tinker around a bit more before I build my prototype.
I found a Ramsey "mini-kit" at fry's for building a simple vox circuit that I'm going to muck around with to see if it will serve.
BTW: The parts can all be had from www.digikey.com.
There is nothing special on the parts list other than the op-amps and the opto-relays and the part numbers came from the digikey catalog.