2 ideas, I'm not familiar with either of these products so these ,may not work.
1) Many Sony devices have a switch on the back to allow you to assign them to one of 3 IR addresses. My Sony CD player, TV and VCR all have this feature.
2) If the above doesn't work, how about turning off one of the unit while the other is on. Then use the Power button on the remote to "toggle" between the 2 devices. When the power toggle is recieved one unit will turn on the other off.
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