Is the sound and music different? Unlikely, as sound is a broader concept than music. If the discussion was about special effects/sounds and music, then I would have a clear understanding of the difference.
Regarding Revolution and Evolution, please read my post again and try to answer again. :)
The statement about the "piece" of magic is completely incorrect... and the racial division was not at all based on previous installments of the Heroes series. As you should know, the domestic developers ignored all the castles created previously and, after reading popular and not-so-popular literature, independently drew conclusions about the monsters and their racial affiliations.