POLYVOX PF3 double-stereo filter utilizes the classic Soviet filter chip for a unique and iconic filter tone.  Two independent 12dB multi-mode filters that can be controlled by a single cutoff knob. Turning the filter into a 24dB filter, when connected in series. When connected in stereo, you can achieve interesting effects by using different modes to each channel. A noise generator is on board pre-filter and can be used separately as a source of white and pink noise. Volume as well as clean and processed signal balance per channel. Can be used as two independent filters or stereo mode.