Tech support replied to me, but the response wasn't helpful; I don't think they understood that I don't care about the IR input and just want the IR output to work. Or they don't know how to get it to work. Or it doesn't work. 'Not a huge issue but it would be nice to get it working. I have tried: mono-plug emitter plugged in directly; stereo output to Xantech CB60 Connecting Block; mono output to CB60. I also tried sending signals straight through in various configurations but couldn't get it to work (I couldn't even get the signals to pass through - the 990 ~blocked them). I have a few more experiments I may run.