Response from Sibelius (microtonality)

Well, I received the following quick response on the Sibelius "chat"
line:

You can easily add as many symbols as you like and then use a plug-in
to get the correct playback -- this is, after all, how Sibelius
currently plays back quartertones (see File; Plug-ins; Playback >
Quartertone\Playback).

***I thought I tried this, but I obviously need to play with it some
more. Apparently they claim it's possible...

jp