If you remove the sound and video items from the main navigation menu (via Builder>Nav Menu drag & drop into Inactive) but leave them in the submenu of Profiles, then they are able to upload only via their profile although it's via a subsection/submenu and not directly from their Profile. If you have quick links on the member's dashboard page, they can also add them there which seems more intuitive for where-to-add-stuff to me.
If you want to have a section on Edit Profile to add sound and video the same way the member can add photos (using Manage Avatars), you're probably going to have to dig into the coding yourself, purchase a mod if there is one or hire someone to do it.