As far as I know, the playback engine in MC22 didn't change from MC21. Only an *optional* resampler was added: SoX.
When it gets updated from MC21 to MC22, there isn't a giant code change under the covers. MC22.0.1 (and 2 and 3 and 4 and 5) were just an increment different from the last. So the idea that MC22 sounds different than MC21, other than the SoX resampler option, is kind of strange. I don't think they did anything to the audio engine other than that. Oh, and the new "load files into memory" option. But that's just *more* buffering.
Brian.