First of all, open the speech.txt file.
It's usually found in the
Freedom Force\data\Lang\English folder.
Add the following lines (between the stars)at the bottom of the page. 
MAKE SURE there is one space before every line.

*********************************
 SPEECH_ST_ALERT_01, speech\english\Stormdirect.mp3
 SPEECH_ST_ALERT_02, speech\english\Stormattack.mp3
 SPEECH_ST_ATTACK1_01, speech\english\Stormattack.mp3
 SPEECH_ST_CANTINTERROATE_01, speech\english\Stormhurt.mp3
 SPEECH_ST_DEFEND1_01, speech\english\Stormattack.mp3
 SPEECH_ST_DODGE_01, speech\english\Stormwind.mp3
 SPEECH_ED_FLY_01, speech\english\Stormwind.mp3
 SPEECH_ST_FRUSTRATION_01, speech\english\Stormattack.mp3
 SPEECH_ST_HYPNOSIS_01, speech\english\Stormhurt2.mp3
 SPEECH_ST_INACTIVE_01, speech\english\Stormdirect.mp3
 SPEECH_ST_KNOCKED OUT_01, speech\english\StormKO.mp3
 SPEECH_ST_MENTALBLANK_01, speech\english\Stormblank.mp3
 SPEECH_ST_MAJOR PAIN_01, speech\english\Stormhurt.mp3
 SPEECH_ST_MAJOR PAIN_02, speech\english\Stormhurt2.mp3
 SPEECH_ST_PANIC_01, speech\english\Stormhurt2.mp3
 SPEECH_ST_RAGE_01, speech\english\Stormhurt.mp3
 SPEECH_ST_SELECT_01, speech\english\Stormname.mp3
************************************

save and close the speech.txt file.

then make sure all those Storm sounds are in the 
Freedom Force\data\sounds\speech\english folder.

You will now need to open the Freedom Force Editor, also known as 
FFEdit found in the 
Start Menu -> Program Files -> Freedom Force -> FFEdit menu.

Go to the "Characters tab" in the editor.
Under "Character Details" and in the box for "Name" type Storm
Don't worry about the strength, speed, etc.
Next type in ST in the "Speech ID" box. Make sure the "Campaign Only" 
box does NOT have a checkmark in it.

Scroll to the bottom of the page and click the "Save" button.
You should now see neutral_male pop up in the list of characters in 
the left-hand side of the screen.

Now, go to the "Options" tab in the editor.
scroll to the bottom of the page and click the 
"Generate Language Files" button.

A new window should pop up asking you to locate the speech.txt, 
captions.txt and strings.txt files. The are all found in your 
C:\Program Files\Irrational Games\Freedom Force\data\Lang\English
folder of you installed to the default directory.

After a minute or two, you should receive either a "Success!" message 
or an error message if there was a problem.

If you got the "Success!" message you're all set and can run the game. 
In the game, choose a character you want to use those sounds from the 
Characters menu and under the voice lists, you should find a new entry 
called "*Storm"

Choosing this will enable you to hear his speech files during gameplay.

*NOTE: I included the sound files of Storm using her special moves.
I'm not sure how to put them in for specific moves (ex: using
"Stormtyphoon.mp3" for a move called "Typhoon" or even if it
can be done, but I included it anyway.  I'm guessing that if anyone can
figure it out...it's one of you!