DSP processing formats
When the input is prologic (basic stereo signal from Sky HD box), my receiver sends a processed 7.1 signal but a DD programme retains its native 5.1 output ignoring the extra speakers. I would expect the receiver to process any signal to 7.1 when set to this same DSP setting. Obviously when set to 'straight' or 'pure direct' there is no additional processing and 5.1 or 7.1 signals are as expected. An observation?