Choosing an audio file format
For maximum flexibility, perform all editing in Adobe Sound (.asnd) format. If you primarily use Soundbooth with Adobe Flash, Premiere Pro, and After Effects, use ASND format exclusively. When you want to share files with a broader range of applications, such as disc-burning utilities, save to the WAV or AIF formats. Save to the compressed mp3 and AAC formats only when creating files for the web or portable media players.
Here are details about each audio format:
Adobe Sound (.asnd)
ASND format lets you readjust fades and effects, and store history snapshots that restore previous edits. This format also supports multitrack mixes, which let you combine multiple audio files and scores. Adobe Flash, Premiere Pro, and After Effects import ASND files, tightly integrating those applications with Soundbooth.
Advanced Audio Coding (.aac)
AAC is a compressed format based on MPEG-4. The alternative filename extension .m4a appears in many applications, including Apple iTunes. At similar bit rates, this format achieves higher audio quality than mp3 format.
Audio Interchange File Format (.aif)
AIF is the standard, uncompressed audio file format for Mac OS.
mp3 Audio (.mp3)
mp3 is the most widely used format for web‑based audio and portable media players. This format highly compresses file size, optimizing audio for fast downloads. The compression process, however, slightly reduces quality and introduces artifacts, particularly in quiet passages.
If you edit an mp3 file, avoid saving it to the same format. Resaving in mp3 format recompresses data, lowering audio quality.
Windows Waveform (.wav)
Windows Waveform is the standard, uncompressed audio format for the Windows operating system.