On my Samsung TV's remote, I hit the following sequence of keys to change the input source; 1. Source Key - Displays the list of inputs 2. Up or Down Keys - Select the input you want - There's no option to select an input by hitting a number key. 3. Enter Key - switch to the selected input I programmed the Roamio remote to bring up the list of inputs, however, I can't get the TiVo remote to accept the Up or Down buttons. I've tried all the codes for Samsung TVs and none of them seem to support the Up and Down keys.