Audio for Iphone Developer:Converting and Recording

Afplay, AFConvert, and AFInfo Converting audio files on the Mac is extremely easy due to three built in command-line utilities on the Mac: afplay, afconvert, and afinfo. The easiest to use is afplay – just give it the name of your audio file from a Terminal and it will play away. This is quite convenient when compressing files to various bit rates to hear how they sound.
Recording && Converting