Hi,

I am brand new to source modding (currently reading the developer wiki) and
I need some guidance to know the general steps to accomplish what I want to
do (if it's possible).
I have been working on creating an "alternative" for closed captioning as
another assistive solution for deaf and hard of hearing players.
My proposal is to create a "synesthesia approach", which is making the
player able to "see" the sounds (at least the most relevant) in game (like
here: http://www.youtube.com/watch?v=QWil81gl50I).
In practical terms, that means I want to attach a particle effect that I am
going to create to each (positional) sound effect in the game and some
parameters of the particle effect will be set by features extracted from
the sound signal (using an audio information retrieval framework called
Marsyas <http://marsyas.info/>).

So, with my (very) limited knowledge of source modding, I would like to ask
some questions:

   1. I was planning on adapting the first three chapters of HL2 to just
   include this "synesthesia option". Am I able to use the HL2 content (e.g.
   the vmf files for the first three chapters) or is it not available?
   2. As far as I know, I need to create this parametric particle effect in
   Hammer. Is it possible to include it in HL2's bsp files (as there are no
   official vmf files)?
   3. The Marsyas framework is a dll that can be used to extract
   information from audio signals. Is it possible (and how) to consume this
   dll from inside the mod?
   4. Is there a centralized place in the code to look for playback
   functions so I could "inject" some code there?




I deeply appreciate your help =)

Thanks in advance!

Flávio Roberto
http://www.dcc.ufmg.br/~flavioro/
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