Chorus, Flanger, Sampler, Stereo Delay, and Synth for AudioKit, by Shane Dunne.
Detailed documentation is provided on AudioKit's Website.
To add AudioKitUI to your Xcode project, select File -> Swift Packages -> Add Package Depedancy. Enter https://github.com/AudioKit/DunneAudioKit/
for the URL.
See the AudioKit Cookbook for examples.