docs: def make_butterworth_bandpass_b_a(CenterFreq, bandwidth, SampleFreq, order=5, btype='band'):
      """
      Generates the b and a coefficients for a butterworth bandpass IIR filter.
  
      Parameters
      ----------
      CenterFreq : float
          central frequency of bandpass
      bandwidth : float
          width of the bandpass from centre to edge
      SampleFreq : float
          Sample frequency of filter
      order : int, optional
          order of IIR filter. Is 5 by default
      btype : string, optional
          type of filter to make e.g. (band, low, high)
  
      Returns
      -------
      b : ndarray
          coefficients multiplying the current and past inputs (feedforward coefficients)
      a : ndarray
          coefficients multiplying the past outputs (feedback coefficients)
      """    
      lowcut = CenterFreq-bandwidth/2
      highcut = CenterFreq+bandwidth/2
      b, a = make_butterworth_b_a(lowcut, highcut, SampleFreq, order, btype)
      return b, a