When I entered Audio Ducking as a title, I saw that users were asking for this four years ago already. I use Camtasia about 6 or 7 hours a day, five days a week and it is a PAIN to have to duck the audio manually when you have a narration track and background music. I would even go as far as to say, that having to duck audio manually, by adding, deleting and moving audio points, makes up about 60% of the time I spend in Camtasia. It would really speed up my workflow enormously if this feature was added. There are several video editing programs on the market that already do this, and I'm not talking high-end programs either, so the technology has been out there for quite a while. Please Techsmith, consider adding this feature, as for a program whose main purpose I would say, is in creating tutorials, it's a wonder it hasn't been added long before now.