I have some technical questions about the Oppo 981 related to audio:

1. My Denon amp has only 6 analog input signals (5 speakers plus the sub). When these inputs are used, the amp's DSP surround modes are disabled. Any idea how I can make use of the surround rear speakers in this configuration for added ambience?

2. What are the "mixed" outputs on the back of the Oppo? Are these the surround rears?

3. Are the analog outputs used only for SACD and DVD-A and the digital outputs for all else?

Thanks.