Fix Wan 2.6 Ultra Fast "Generate audio for video” option?

Wan 2.6 Ultra Fast Image-To-Video is a pretty great model/option, especially for the credit cost, and thank you for making it available. However, it has a tendency to add the most god-awful, atonal, ear-splitting garbage “music” at maximum volume to the video roughly 50% of the time when “Generate audio for video” is enabled, no matter how explicitly you tell it not to in the prompt, making that feature a high-risk gamble of 2-11 credits per video to use. Is there anything that can be done to fix that?