When you "edit" your post, you can delete it (as long as it isn't the first post in a thread).
Alf - you can attach sound bites and users can choose to download them (assuming you have sound bites to add). Additionally, you might consider compressing a bunch of files into a zip file. A user that chooses to download something like this does so at their own risk of course.
E-mail me if you have questions.