private void button3_Click(object sender, EventArgs e)
{
var lff = FourierTransformer.LFF(fft, wav.Frequency, Convert.ToDouble(textBox2.Text));
var data = lff.Select((c, i) => new SignalPoint {
X = i, Y = c.Real
});
SaveWav(@"D:\stud_repo\astu\DS\FourierTransform\FourierTransform\wav\lff_test.wav"
, data.Select(p => (int)p.Y).ToArray());
chart5.DataSource = data;
chart5.Series[0].XValueMember = "X";
chart5.Series[0].YValueMembers = "Y";
chart5.DataBind();
}