On Roamio OTA DVR can you go back to a previous station? It's useful if you're keeping track of a couple of football games etc. On the bottom left on the remote just under the Enter key is a gray "Last". It doesn't go to previous station. Do you have to hold another key on the remote and hit enter for that function to work? I've programmed the "Last" command into a Harmony remote, using their command set. With "Last" selected there is no IR emitted (box doesn't blink). I thought I'd just relearn the command from the TiVo remote which is how I found out it doesn't work from the Tivo remote.