y = Signal.fill(256, { |i| (i * pi / 3.4).sin });
x = Signal.fill(256, { |i| (i * pi / 3.33511).sin });
(y+x).plot;

d=(y+x);
c = d.fft(Signal.newClear(256), Signal.fftCosTable(256));
c.magnitude.plot;

e = Signal.newClear(8192).overWrite(d, 0);
b = e.fft(Signal.newClear(8192), Signal.fftCosTable(8192));
b.magnitude.plot;