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Add this function in a subclass to get a notification just before an audio clip is being imported.

This lets you control the import settings trough code.

    class MyAudioPostprocessor extends AssetPostprocessor {
    function OnPreprocessAudio () {
        // Import files containin "mono" in their name as mono.
        if (assetPath.Contains("mono")) {
            var audioImporter : AudioImporter = assetImporter;
            audioImporter.forceToMono = true;

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