Hi! Nice to meet you. So you need a module to install inside a helmet that could reproduce some voice fx from Mass Effect series right? That sounds cool! I could do that, i'm an audio engineer but i have some hardware experience with Pi, Arduino, microphones, diy electronics and more. I have my own lab for these projects.
I can do a blueprint of the project to explain you the costs and the realization, then i can make some prototype and share them with you via skype or discord. When the project is ready, i can mail it to you and explain you how to install it.
Please contact me for info,
Fabio.