In the first Udacity Nanodegree iOS Developer (course 1) I built an app called Pitch Perfect from scratch. Pitch Perfect allows the user to record audio using the device’s built-in microphone. The user is then able to use this recorded audio file to add four (4) different effects to it. Those effects are namely, Slow Speed (Snail Image), Fast Speed (Rabbit Image), High Pitch (Chipmunk Image) and Low Pitch (Darth Vader Image). The Framework that was used is AVFoundation. Introduced to iOS 8 is AVAudioEngine which is used in Pitch Perfect to vary the Pitch to “Chipmunk” and “Darth Vader” effect . One of the main resources/websites I used in researching during building Pitch Perfect was Stackoverflow.
Here is my Github repo for Pitch Perfect: