I have a rather large (>25GB) music collection, and my iPhone is currently almost full.
I just saw this option in iTunes:
This would probably be very useful to me, but I'm concerned about sound quality at such a low bitrate. Is it possible to change it to at least 160kbps from the default 128kbps?
Also, if I check the box, will the conversion occur on the fly (i.e., seamlessly while copying songs to the iPhone), or will iTunes basically create copies of all my songs in 128kbps AAC (thus causing to take up a lot of space on my Mac)?