[htnut12]

YPAO and MCACC allow adjustments after calibration. Audyssey does not. As stated by Kal if you want to adjust frequencies or the like you are just doing a manual setting job, not tweaking Audyssey. I think that Audessey Pro has some tweaking opportunity, but not the varieties in receivers.

I have Audyssey Lite in my Denon 2307CI. Nice job of smoothing things out. Wipes out bass but I don't mind because I have all the latitude in the world to adjust that. You cannot even save a run, try again and then go back if it works out that the previous run was better. And it has my system a bit too bright. No way to fix that in the seven channels. Only if I were to manually set up everything. There is a huge thread on Audyssey on AVS.

That said, I will be picking up a Pio 94 tomorrow with MCACC. You can save six different MCACC runs, tweak anything you want, etc. And it displays a bunch of graphs for you on a computer with the Pio software.

Yamaha has some nice software for the 1800 3800 to help with setup.