Regarding room correction, @brian / @joel etc., it would be fascinating to get your view on Sonos TruePlay as a concept:
a/ Whether wandering around waving an iPhone as opposed to a calibrated mic could possibly be effective, or is just a nice marketing gimmick.
b/ If the answer to a/ is yes, whether this kind of system might make it into Roon sometime? It would certainly open up room correction to a wider audience (including me) if so.