Regarding the front panel mounted variable/fixed switch on the Dac-9x, could this be clarified in terms of function and use? If the Dac-9x is utilized to directly drive amps as NP intended, such as driving 2xAMG STA (bridged), the variable setting will obviously prevail. However, would the fixed setting be preferred for the Dac-9x driving an AMG PRA? Does the fixed setting effectively bypass the DAC-9x pre-amp stage, or does it just run it at 100% volume, with volume control then provided by separate analog PRA? Lastly, how would you assess the overall sonic performance of the Dac-9x, both with or without the AMG PRA, again driving 2xAMG STA (bridged)? Thanks.