How to change pitch of logic pro x sample

Hi,

I have recently found a good sample to make into a kanye style beat (with the chipmunk style vocal sample). How do I change the pitch of the audio without altering the tempo or changing the formant. I have already chopped the sample and have 7 different parts that I would like to change. I am very new to logic pro so please can any explanations be simplified if possible.

thank you please respond ASAP