Ernie,

It's been a while since I've used the pronto RF receiver, but the last one I used had 4 3.5 mini outputs on it. In theory, I would think you could simply solder a couple of mono mini plugs on either end of a shielded cable, extending the output phase (which is now flashing IR) of the Pronto RF unit, and plug into your Xantech block's IR input...

I don't know why the components aren't responding acuratetly, that's perplexing to me....they should be essentially the same codes at the same intesity and frequency, as the remotes that originally taught them...

Let me know how it turns out!

avdude