So I just got a Harmony 880. I have it set up to work with my TV and Motorola digital cable box. It works good, just not as good as I'd like. I have to change the device if I want to change the channel (with the cable box) or turn up the volume (on the TV). Is there a way I can permanently set it so that the channel always changes on the cable box and volume on the TV? Also, how do I turn everything on? There is only an OFF button.