Moog 4pole library is divided into three emulation presets. Sharp, soft and standard. Each EP has 75 interpolated samples and 3 Kernels, sampled at 24 bits and 96 kHz. Those 1 knob/fader emulation presets are very simple to use and are based on a renowned low pass four pole resonant filter. Moog 4pole library include level interpolation and frequency morphing plus 3 Kernels creating a smooth resonat filter FX.
Moog 4pole Sharp EP has a more evident resonant filter effect. At 0 cutoff value works like a hi cut filter, 55 Hz and 6 dB/oct slope. Increasing cutoff parameter value moves cut frequency from lows to highs and increase slope too. At the cut frequency a nice peak is created (resonant effect). Moog 4pole Soft EP and Stnd EP works similar than Moog 4pole Sharp EP but the peak created in the cut frequency is less obvious.