Helmet vox?

[dung0beetle]

You might try one of these. They have some voice changers and other special effects electronics too.
http://www.hyperdynelabs.com/products_elec.php

 

[Yayu]

Here's something cheap for future projects

http://www.amazon.com/Mania-SPY-EARS/dp/B0006GKFZ8

Sound quality might be horrible without some sort of aide. For that kind of price though, dismantling it and lining the innards into your helm wouldn't sting so badly.

 

[Jax Archillies]

i dont know anyone in the 501st that uses voice changes except for fetts and vader.

there is a kit going around right now for 60 bucks that is 10watts and loud as hell and includes a bluetooth headset.

best thing you can get. go look around your local garrison boards or the FISD or MEPD boards and someone will have it up.

 

[Roadwarrior]

All you need is a 9.99$ voice changer with a "Your Voice" setting.