I know nothing of this filter and only have the panel (I use the reverse side for a blank panel). It apparently is an enhanced clone of the Syntron Syrinx filter which had two resonant peak filters and a low pass filter originally designed around a pair of CEM3350 dual voltage controlled state-variable filter ICs. This iteration of the filter appears to use a CEM3328 four pole voltage controlled low pass filter IC instead of the CEM3350 and is normalled to the output of the dual resonant filters. It also has a three input mixer and two CV inputs for each of the filter sections.
The upper half of the panel layout and legends matches the original Synton Syrinx filter panel.
The bottom of the panel matches the original Synton Syrinx graphics.