...
filterType=0, Simple pass through with unity gain.
filterType=1, Linear gainGain in dB. [gain].
filterType=2, 1st order Butterworth low pass filter. [freq].
...
...
filterType=0, Simple pass through with unity gain.
filterType=1, Linear gainGain in dB. [gain].
filterType=2, 1st order Butterworth low pass filter. [freq].
...