Jon,
I sent an email earlier from my cell but the reply was cut off. I am troubleshooting my setup which uses the USB-UIRT, Homeseer and a Xantech connecting block with emitters. As far as I can tell from your answer, when I point a remote at the USB-UIRT, it receives the signal as shown by the talkback LED, then sends that signal to Homeseer; it does not re-transmit it out the 1/8" plug. The only way to have the USB-UIRT transmit a command out through the 1/8" plug is for Homeseer to issuer it. If this isn't correct, please respond, otherwise I'll assume this is how it works.
Thanks for your help,
Alan