Voice changer over phone call Android App

Hi, I have done quick search on voice changer and found open source libraries to support android apps. I have idea how it can be done. More discussion required to know voice detail to be changed.

Dear sir/madam I am graduate in computer science having 4 years of extensive experience in android development and design. I love to work in android applications. Please have a look onto my employer's reviews on my profile so you can get an idea of my quality work. Relavant Skills I have much experience in android. I have worked on Sms and calling app, Dating app, Painting tool, Mobile website and much more. I will provide you 1- Complete Code 2- 2 free revisions 3- Attractive design that will be compatible with different screen sizes. Kindly inbox me details. Regards Ahsan Nazir