To: tanirae
Hello,
I would suggest you easier way to perform the task.
First of all, you should extract audio from you video track. You can do it selecting video file in Media Library, click right mous button on it and choose Extract Audio option in the context menu. Now you can add audio without interaptions to soundtrack line in AVS Video Editor and mute audio track of the main video line (right mouse click on the video and Mute ).
Then split main video to scenes which you want to remove using
Split button and insert the images you want instead.
For the end just click Produce and combine your edits to one file.
I hope it helps, but if you need further assistance, we are here to help .
Regards.