The algorithm has been refined and improved multiple times in just the last month, so if the last time you tried it was months ago, you should consider giving it another shot now. It has been improved quite dramatically. I’ve been playing around with it today since the most recent round of updates and getting quite decent results now in conjunction with my UMIK-1 mic.On the room correction side, I found the inbuilt WiiM stuff pretty terrible last time I tried it (a few months ago). Running through the process multiple times would give wildly different results, and none were close to sounding as good and what I got from HouseCurve. This was with a Pro Plus, but I assume the algorithm is the same for the Ultra.