Will require use of external library, probably [AudioKit](https://github.com/AudioKit/AudioKit). Some examples of tuners are shown below: 1. https://github.com/kodydeda4/swiftui-guitar-tuner 2. https://github.com/jpsim/ZenTuner 3. https://github.com/Matt54/SwiftTuner 4. https://github.com/timdubbins/TunePro
