Storyline and Studio support a wide range of audio file formats, including AAC, AIF, AIFF, M4A, MP3, OGG, WAV, and WMA. However, some codecs and bitrates might cause unexpected feedback in your courses, and some might cause an error when you import them: "Unsupported audio file or bitrate." If that happens, we recommend converting your audio files to 16 bit 44 kHz PCM WAV for the best results.
You can use your favorite editor to convert your audio files. Not sure where to start? Check out this video tutorial on using Soundbooth and Audacity to convert audio. And here’s a video tutorial on using iTunes to do the same thing.