I have a Rotel RSP 1068 HT processor and a 6.1 system. I would like to have different configurations for movies and music. For movies I want to use my rear speaker (6.1). For music, I do not want my rear speaker active. I just want 5.1 for music. Can I set up my 1068 this way? If so, how? If not, is there a processor that lets you do this? Thanks for any help on this.