This filter is a specialist in changing the overall sonic character of a signal with ease. Its main function is to change the proportions between high and low frequencies. The principle is quite similar to a pair of scales: depending on the gain setting around a variable center frequency, the high frequencies are boosted whereas the low frequencies are attenuated (or vice versa) at the same time. The center frequency can be shifted continuously between 26 Hz and 2.2 kHz or between 260 Hz and 22 kHz respectively (when the x10 switch is activated). The characteristics of the filter change in the extreme positions of the EQ Gain controller: The fully counter-clockwise setting will give you a low pass filter; fully clockwise position will result in a high pass filter.
