Solved! Go to Solution.
adding... the xr15 is designed not to be used with IR for set top boxes. it probably sends out a discover zigbee RF message all the in-range set top boxes can receive. each remote can be paired to but one set top box at a time but each set top box can have up to 5 remotes paired to them via RF. Each TV will have its own code (unique) so just use another remote in the other rooms to dismiss or let it time out.
So, I figured it out. It was mostly operator error. After I paired the remote with the cable box, I was using the wrong key combination to pair the TV and stereo. HINT: Don't be in a hurry when you do it. Read the screen carefully. Bottom line is it works and thank you for the assistance.