[Orgmode] removal of appointments

[Richard Riley]

I use

(run-at-time nil 300 'org-agenda-to-appt)
(appt-activate t)

to add org tasks to emacs appointment handling.

Is there a way for org to remove these entries when marked as done or
cancelled?

While on the subject, is there any concept of an "alarm" in
org? Or is this just a scheduled item? It would be nice of there was a
way to trigger specific functions based on the tags  -e.g play wave file
for a reminder of a task of a certain type. Is there something like this
anyone can recommend or point me to? I would like to configure org as my
alarm clock too!

-- 
 important and urgent problems of the technology of today are no longer the 
satisfactions of the primary needs or of archetypal wishes, but the reparation 
of the evils and damages by the technology of yesterday.  ~Dennis Gabor, 
Innovations:  Scientific, Technological and Social, 1970