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This is a paid asset, but now you can download Sound Cutter Free.
Sound Cutter v1.0
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Sound Cutter is an editor that allows you to easily cut audio clips in Unity.
You can select and playback audio clip regions that can be removed/kept depending on your needs.
Source audio clips are not modified and results are saved to new wav files.
Works with both free and Pro version of Unity.
Unity 5 is supported!