Change bitrate from the default 128kbps for syncing songs to iPhone 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)?
As far as I know iTunes does not offer any other options for bit-rate conversion. This conversion does indeed happen on-the-fly, as you sync your iPhone with iTunes, which makes the syncing take longer but saves space, so you have not to worry for duplicates on your mac.

If space is an issue and you have some spare $25 I also recommend you give a look to iTunes Match: it will allow you to store your music on the Cloud, so you can download the songs as you listen to them thus you have not your huge iTunes library sitting on your iPhone but it still is available when you need it.