The MMF-6 is a multi mode filter with six outputs, first three from the left; "clean" low pass, band pass and high pass.

Low- band- and high pass to the right are processed by three separate (for every output) saturation circuits with two modes; soft and hard. Additionally, the filter core has so called "symmetry" control for the resonance and cutoff frequency. It is possible to control cutoff so positive and negative going signals have different cutoff frequencies, from a subtle "edge" to very dramatical character of the audio signal (including frequency division effect). Now it's possible to imitate the famous Moog filter (it can not replace it, of course), OTA based filters and others. All this by modulating symmetry by one of the outputs (pre-patched to "clean" low pass output) or an external signal. Now it is possible to mix clean and saturated audio signals in any combination.

• Total frequency controllable range: 5Hz to 22kHz
• Maximal input/output audio signal: 20 Volts p-p
• Slope: 12dB/oct
• Modes: Low- Band- High Pass