let package = Package(
  dependencies: [
    .package(url: "https://github.com/musical77/MusicalInstrument.git")
  ],
)

// create a piano, and play middle C for a second.
let piano = Piano.default
piano.play(at: "C4", with: .intensity(60))
Thread.sleep(forTimeInterval: 1.0)
piano.stop(at: "C4")

// prepare piano and violin and audio recorder
let piano = Piano.default
let violin = Violin.default
let recorder = AudioRecorder(audioEngine: .default)

// start recording, save audio file (*.caf) to your faviorate destination.
_ = recorder.startRecording(saveTo: URL(...))

// let's play some music
violin.play(at: "E4", with: .intensity(100))
piano.play(at: "C4", with: .intensity(50))
piano.play(at: "E4", with: .intensity(50))
piano.play(at: "G4", with: .intensity(50))
Thread.sleep(forTimeInterval: 1.0)
violin.stop(at: "E4")
piano.stopAll()

violin.play(at: "D4", with: .intensity(50))
piano.play(at: "B3", with: .intensity(50))
piano.play(at: "D4", with: .intensity(50))
piano.play(at: "G4", with: .intensity(50))
Thread.sleep(forTimeInterval: 1.0)
violin.stop(at: "D4")
piano.stopAll()

// stop recording and get audio file
let url = recorder.stopRecording()
print(url)