private void button5_Click(object sender, EventArgs e)
{
AD9958 selectedDDS = ddsList[deviceListBox.SelectedIndex];
List <double> freqs = new List <double>();
List <double> relAmp = new List <double>();
double start = 10e6;
double incr = 1e6;
int nSteps = 20;
for (int k = 0; k < nSteps; k++)
{
freqs.Add(start + k * incr);
relAmp.Add(1 - (k / ((double)nSteps)));
}
selectedDDS.SetFrequencyAmplitudeList(freqs.ToArray(), relAmp.ToArray());
}