This is interesting as I have had several problems when trying to combine the two units but haven't tried the 791-44 method.

I would like to know what everyone who has experience this problem uses to overcome the issue of a two zone system i.e. Harman Kardon receivers - where the main zone is controlled by the RX77 and the second zone is an IR sensor.

If you have say about 3 common components (that can't be used with the HK IR bus system) to combine with IR.
How do you do it and still independently control each individual zone.

I have achieved this in the past for IR by using the Xantech ZC21 2 zone block.
However have had problems combining an RX77.

Thanks.