let n0 = FloatLiteral { value: 440 };
let n1 = dsp.oscillator(frequency: n0.value) { waveform: "sine" };
let n2 = dsp.fft(signal: n1.signal.clone()) { size: 1024 };
let n3 = Max(input: n2.magnitude.clone());
let n4 = Std(input: n1.signal);