If the movie or song is less than 30 seconds in length, PocketMac RingtoneStudio converts it automatically into the proper ringtone format.
If it's longer than 30 seconds, PocketMac RingtoneStudio will open up a preview window so that you can select the exact 30 second clip you'd like.
PocketMac RingtoneStudio will place your completed ringtones into iTunes' "Ringtones" folder.
The next time you connect your iPhone, your ringtones will be automatically synched.