[Cheesehead]

LtRt should be retired IMHO.
It was a technology for a time when bandwidth wasn't available/ allotted for discreet surround channels.
Not only is the decoded signal often unsatisfying in surround, but it also to my ears makes the encoded stereo version lack definition.
It was great and clever for its time.

I don't see it being asked for so much on deliverables any more thankfully.
I hope it will gradually disappear.