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If the audio has the dialogue mixed equally in both left and right channels (centered in stereo image), you can use tools in some audio programs to isolate the “center.” In Audacity, there’s a Vocal Removal and Isolation filter for this. Developed to remove vocals from songs (usually mixed in the center of the stereo image), but they added the option to isolate the center instead of just removing it. There are probably expensive plugins that do a cleaner job, but the Audacity freebie isn’t bad.