We Need To Pitch Shift a Voice In Audio File...

Hello Everyone! I got some job to do!: ) I make a prank videos and I have to pitch shift a voice (or use some other interesint fx if somebody got better idea) in maaany many many videos which I recorded… Just for now I want to set a project for 1 hour audio where I want to ask for changing voice of some persons which you can hear on it… If everything will be ok and our cooperation will be fine for sure in nearest future I will got plenty of work like that to do… (aproximietly something around 50 hours maybe even more!: ) If you are interested in please write me some message how much your service with this project will be cost me and we are in touch! : ) Ps. In attached files I send you a example of audio to let you know what I am talking about and what is a quality of sound.