I've read a few posts mentioning there are a few, but no reference to any make/models.

 

that's because they are rare -- very far and few between. to the best of my knowledge, there are currently none in production.

now, let me just say, i don't know every head unit out there, and all their abilities... but i'm reasonably familiar w/ most current models by the big manufacturers, and of those -- i haven't seen one in quite a while.

if you happen to find one, let us know please. but having said that -- i wouldn't waste too much time looking.