Well...
Yes, indeed the price for the Oade Advanced Concert Mod on the PMD 671 is $450. I will have mine on Wednesday...
The RCA inputs will still work and Doug recommended they be used for line level signals.
He also told me the input knob is an attenuator, so it is best to run it higher rather than lower on the scale (~7-8 is what he said)
He said it may be nessessary to use the onboard pad for very load shows. This is probably microphone dependent.
For me, the wait is
almost finally over...