## void FlButterworth | ## (float low_cut, float low_r_o, float high_cut, |

This routine will use fft's to make a butterworth filter in the time domain.

This routine will use fft's to make a butterworth filter in the time domain.

**Parameters:****low_cut**- is the low frequency cutoff of the filter in units of cycles per second.**low_r_o**- is the roll off rate of the low frequency cutoff, in units of 3Db per octave.**high_cut**- is the high frequency cutoff of the filter in units of cycles per second.**high_r_o**- is the roll off rate of the high frquency cutoff, in units of 3Db per octave.**si**- is the sample rate of the filter, in units of seconds.**nsamp**- is the number of samples in the filter.**filter**- is the filter trace produced.**Returns:**- none.

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