Stop the presses. If you have converted music to ALAC then if you then go encoded them back to 256kbps ACC you will lower the quality. Basically when you converted from 256kbps files to ALAC the encoder filled in the missing data with null data. However when you go to encoded them back to 256kbps the encoder doesn't just remove the null data but treats all data the same. It will therefore discard some of the original content while leaving some of null data in the 256kbps encode. This will result in a lower quality than the original. If converted to ALAC then you should leave them that way.
AHHHHH good to know!!! I did not know that. Thanks!! "Stop the presses" was hilarious