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Katowice is a variable stereo band isolator, or in other words, a CV-controlled 3-band stereo crossover with individual outputs for each band and a sum output. Katowice can be used as a crossover network, parametric EQ, DJ-style kill filter, or for other band-selective applications, including multiband compression and stereo enhancement.
A stereo input signal is split by Katowice into three bands: low, medium and high. The two potentiometers and associated CV inputs define the center frequency and bandwidth of the mid band, and the low and high bands are automatically adjusted so that the sum of all three bands results in a complete signal. Each of the three non-resonant filters has an edge steepness of 24 dB/oct. The three sliders and CV inputs above them are used to adjust the volume of the three individual bands. Right, each band has its own stereo VCA! The global limits of the AC-coupled circuit are between 30 Hz and 20 kHz and the middle band can have a bandwidth of 10 octaves. The three bands as well as the sum can each be tapped in stereo.
