You're not really allowed to edit someone else's work. Best to shoot your own material.
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The issue that you have described looks like an issue with the source patching wherein the source indicator for the audio tracks might not be enabled. (Please check if A1 is highlighted for the source indicator on the audio track)
You may want to go through this small video, this explains source patching and track targeting.
Source patching starts at 04:41.
Hope this helps.
Sumeet Kumar Choubey