I've just bought a MacBook Pro, and as a Mac virgin, as it were, I'm having some problems. I want to be able to sync music from 320kbps to 192kbps to my phone card. I've only got 4GB storage on my phone, so I need to cut down on file size.

I have no problems doing this on my old Windows laptop, but I don't see a way of doing it on a Mac, unless I'm syncing to an iPod. Any ideas?