So, while plugging in my iPhone... I noticed iTunes had an option to "Convert higher bitrate songs into 256AAC" I understand that this means, certain songs with the ability to sound better in AAC than mp3 will sound better. But after converting my a large portion of my music into this 256AAC, my iPhones music went from 8gb of music to 7.8gb.... If I am making my music sound better coming thru my headphones, should my phone require more memory for the music? And should I just switch it back to regular mp3 quality? Will the other songs that did not get converted actually sound worse?