Logic stores freeze files at a resolution of 32-bit float to preserve the massive dynamic range (almost 1000 db) that its audio engine affords. This prevents extreme plug-in settings from causing clipping in files when they are rendered, ensuring that the frozen tracks will sound identical to their unfrozen states.
Previous versions of Logic Pro offered the option of freezing files at 16- or 24-bit depth to allow these rendered files to be used in other songs, or even other applications. However, there was some danger that the frozen tracks could clip, depending on the plug-in settings used. Logic Pro 7 offers a wealth of new export features that make changing the bit depth of frozen tracks unnecessary.
To export a track (with all its DSP rendered), simply choose File > Export > Track as Audio File. To export all audio tracks in your Arrange window as separate audio files, choose File > Export > All Tracks as Audio Files. To export an individual region with its DSP rendered to a file, choose File > Export > Region as Audio File.
When exporting tracks, note that any reverb or delay tails will be included with the exported file, but the files created from exported regions will be exactly the same length as the original region. This allows you to easily create loops using the export region feature.
You can export tracks and regions as AIFF, WAV, or SDII files, making them compatible with virtually any other audio application available. If you export regions as WAV files, they will be written as Broadcast Wave Files (BWF), which means they will include time-stamp information. Tracks are always exported starting at bar 1 in a Logic song, so time-stamping is not needed for them.