Ducking Previewer
Upload a music clip and a voice clip and hear the music automatically "duck" (get quieter) whenever the voice is speaking — the same trick podcasts and voiceovers use under background music.
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About this tool
The voice clip's level is measured in short blocks; whenever it rises above the threshold you set, the music's gain eases down toward the "duck to" level, then eases back up once the voice drops quiet again. This is a simplified version of sidechain compression, the standard studio technique for keeping voiceover intelligible over music.