I haven't used the 990's IR output, but some previous discussion of IR in/out connections seemed to suggest that in many cases the IR output simply passes through whatever signal comes in to the IR input jack (and thus not signals received by the device's own IR sensor). I haven't talked to Outlaw about this myself, but they might be able to offer some better insight into at least the 990 side of the equation if you
ran it past them .
As you may have noticed from some other related threads, I set up an
IR distribution system even before I got my 990 because of the limitations imposed by my cabinet. My Pace box has an IR input on the back that did not work with my IR system - I suspect that it requires the same integrator that the 990 needs (and that I never bothered to get).