[C#, notes] NAudio Fourier transform forward parameter and m parameter

forward is whether to average the result (divided by the number of samples), so that the number of samples will not affect the size of the result value.
m is the number to be transformed, but it is an exponent of 2, that is to say, 2^m must be less than or equal to Number of samples
Because the Fourier transform can only perform the Fourier transform of 2^m data