iTunes conversion feature mostly needed to those who often import CD tracks to libraries. By default, iTunes converts CD tracks in CD equivalent quality but also lets you tweak with conversion options of iTunes native encoders to further enhance the quality of ripped CD tracks. There is apparently no direct and easy way to quickly convert tracks present in libraries and also to change the iTunes audio encoding format. Quick Convert is AppleScript based applet for Mac which integrates into iTunes as a script to help users quickly convert selected or all tracks in playlist using iTunes supported encoders, including, AAC and AAC M4B, AIFF, Lossless, MP3 and WAV encoder and send them to defined playlist to keep the track listings organized.
Installing AppleScript applet into iTunes in easy. Before you start out, make sure that iTunes is not running in background. Now head over to <user>/Library/iTunes folder and create folder by name Script in iTunes folder. Once created, copy Quick Convert download package content to Scripts folder.
Now eject the disk image of Quick Convert and launch iTunes. You will see a small icon next to Windows menu on system menu bar. Clicking that icon will open Quick Convert conversion console.
Before you proceed with conversion process, select tracks which you want to convert and send to playlist, and then choose the encoder from Quick Convert applet. It provides option to delete original selected tracks after conversion to avoid duplicates. If you want to send tracks to playlist, enable Copy new tracks to playlist option, enter playlist name, and click OK to start the conversion process.
It is worth mentioning here that Quick Convert can’t set audio bitrate and sample rate. Therefore, you will need to manually set them from Preferences –> General –> Import Settings window. Quick Convert works on Mac OS X 10.6 and 10.7.