One of the characteristics that brought iTunes 9.1 but has been little market, is the ability to free up space on our iPhone / iPod Touch / IPod nano / whatever, to convert the songs of higher quality / bitrate to 128 kbps AAC.
EyeThis will not change the original songs in our musical library: our library holds the original versions. What happens is that all the songs in sync, will be converted to house only on the iPod Touch / iPhone.
The option to do so, is on the same page sync iPhone / iPod Touch, at the bottom:
The result? To see several gigabytes released (if we have high quality music). In my case, with 10 Gigabytes devoted to Audio (between podcasts and music), had to convert around 1335 songs. The process, as you can imagine, was quite long (less gigabytes of music will take less).
But once completed, the end my 10 gigabyte music ended at around 5.5, with an acceptable quality audio files.
So if you are running space on iPhone / iPod Touch in the amount of applications and / or games, is compression option is pretty good!
(source : arturogoga)

