Thanks PG and Romantique Tp. I’m not looking for big differences, but small ones. And I know 320 cbr compares closer technically to the source than 256 cbr because I’ve done it. Whether I can tell blind I’m not really concerned with.
And all the other programs have 320 cbr, Sonnox did it somehow. And i’d like to compare 320 AAC to 320 MP3 because it’s a very standard bitrate, and 44.1 is a very standard sampling rate.