[TeMPOraL]

Don't know about stylus and haven't heard about sound recording for Emacs (never searched, but if there's none, then I'm sure this oversight will soon be corrected) - but for media files in general, org-mode allows you to manage "attachments" to textual notes. It works by making a copy of the attached file and storing it in a special directory structure next to the note, and then storing a UUID + list of file names in the note itself. This is probably the only reasonable way to associate extra binary files with a note that needs to remain plaintext and human-readable. Such attachments are then 3-4 keystrokes away from being perused in whatever program you usually open a given data type with.

(Of course if you manage such media manually and don't need a copy stored with note, you can use regular org-mode links to point to files, both local and remote.)

You're probably thinking about displaying media inline, and I agree this doesn't have a good implementation. I'm not aware of support for anything other than inline images, and even with pictures it's pretty rough at the edges. While it works for plots & figures (especially ones you generate straight from your notes, i.e. Jupyter-style workflow), I still haven't figured how to set up some scaling for those images. Also last time I checked, displaying larger images inline gave a somewhat choppy experience.

Overall it's not a big problem, but it does change the way you make notes. The king of "multimedia notetaking" is still Microsoft's OneNote, and long ago when I was using it, my notes would have a lot of pictures and screenshots mixed with text. In org mode, I naturally avoid having to make such notes; I trade it for being able to make text-only notes much faster and better.