I have a Harmony 890. Can I program the additional custom buttons to change to a unique channel on my PVR? I want to use my cable PVR to listen to music on my receiver without having the TV on to see the channels. I want to program buttons so that "Classical" changes to the classical channel, "Blues" changes the PVR to the Blues channel, etc. Is this possible. I don't see a way with the drop down list of commands for my PVR. Thanks.