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Thanks! Although I don't understand "envelope," I think you're saying to add a short new track with the desired background noise and then fade both the new track and the original track(s) in and out so that the paste won't sound abrupt. Then when playback sounds find, merge the tracks. Sou...

Given: because this is a movie soundtrack, I can't change the length of it. I want to delete a few flaws in the soundtrack and replace the space with a different portion of the soundtrack. (For example, during a section of nondescript background noise, I hear someone say "Okay." I want to ...