Just a quick one
I’ve recently had a project over 300 sounds that need to have a setting changed across all of them.

Initially I found that looking inside the .meta files (in Force Text mode) there was the following for the audio file:

fileFormatVersion: 2
guid: 3c7ec8b33f0ff4ad9a950a58e872ea62
AudioImporter:
  serializedVersion: 4
  <strong>format: -1</strong>
  quality: .5
  stream: 2
  3D: 0
  forceToMono: 0
  useHardware: 0
  loopable: 1
  userData:

I found that by changing the “format: -1” to “format: 0” it set the audioclip to be imported as compressed instead of .Wav

fileFormatVersion: 2
guid: 3c7ec8b33f0ff4ad9a950a58e872ea62
AudioImporter:
  serializedVersion: 4
  format: 0
  quality: .5
  stream: 2
  3D: 0
  forceToMono: 0
  useHardware: 0
  loopable: 1
  userData:

Obviously that isn’t the most idea solution in the world, so I decided to look for scripts to automate changing the import settings for audio clips inside the editor. Here is what I found!

/////////////////////////////////////////////////////////////////////////////////////////////////////////
// Batch audio import settings modifier.
//
// Modifies all selected audio clips in the project window and applies the requested modification on the
// audio clips. Idea was to have the same choices for multiple files as you would have if you open the
// import settings of a single audio clip. Put this into Assets/Editor and once compiled by Unity you
// find the new functionality in Custom -> Sound. Enjoy! 🙂
//
// April 2010. Based on Martin Schultz's texture import settings batch modifier.
// See http://forum.unity3d.com/threads/77816-Changing-import-settings-for-multiple-audio-files
// Modified by Sander H. and downloaded from CaptivatingSound.com - v1.1 April 5, 2013.
// ////////////////////////////////////////////////////////////////////////////////////////////////////////

Download it here!

Make sure to shove it in the Assets/Editor folder (Make one if not) and you’ll find the “Custom” bar appear at the top of your editor. Definitely a lot easier!

Just select all the audio clips you want to change and use the new functions!

Enjoy