Being a hobbyist audiophile I understand a music file that has been transcoded is of poor quality. Personally I prefer my music ripped at V0 Mp3 through LAME. It gives me, IMO, the best compromise between quality and size (though I still have many with a 320 bitrate). I would like to be able to have more music on my iPhone. I do not want to purchase a bigger iPhone. I do not want to manually manage my playlists either. I do not want to re-rip all my CDs again at a smaller file size. I've read that for portable use (i.e. listening to while driving, on the subway, or in an airplane) V0 can be overkill. That high quality is unnecessary with such background noise. Specifically I read (and unfortunately I don't remember where) that you can get away with lowering the sampling rate (not bitrate) to 16khz, although that may be wrong, sounds very low. What I want to do is transcode my existing files to a smaller file size. In the last paragraph I read that lowering the sampling rate is an option. Would this be more effective for my needs than lowering the big rate? I guess I'm curious about my options. I do notice that at least in iTunes AAC (should I choose that end format) does not offer many options for a lower sampling rate. In the past I've stuck with Mp3. Should I consider AAC for my situation and why--is it really that more efficient? My other question is how would I then handle my newly made duplicates and syncing my iphone to my computer. A few months ago I tried doing this and noticed quickly by making transcodes I created duplicates in my library and my playlists and everything now has cluttery duplicates. Unless I can make these transcodes invisible except for managing my music on my iPhone I don't know how to now sync my iphone with iTunes. Any expert advice!? Much thanks in advance!