MMF-2

Stereo multi mode filter

The MMF-2 is a stereo multi mode filter which can operate in a true stereo mode or as two independent filters A variety of possible modifications and re-shaping of your sound material is the goal for the MMF-2; as a post production filter with mix and pre/post saturation and as a tool for experimentation with both mono and stereo audio material with all CV controllable parameters in full audio range. The module is build around three functional blocks; filter, saturation stage and mix.

FILTER
The heart of the MMF-2 are two four pole multi mode filters with six selectable outputs for the main stereo outputs; low pass, low-band pass, band pass, band-high pass, high pass and notch + bypass. Three outputs/filter are available too; low pass, band pass and high pass and which are not affected by the saturation in the post mode. The corner frequency (CUTOFF L and CUTOFF R) is individual for both filters and the MASTER CUTOFF controls both. The Q-PEAK determinates the resonance upp to self oscillation point and is controlled individually or by the LEFT Q-PEAK when activated by the switch LINK TO LEFT. Both CUTOFF and Q-PEAK can be controlled manually and by inserted signal(s) in to the CV inputs. Those CV signals can control left and right filter and/or both when control signals are inserted in to the MASTER CV inputs.

SATURATION
The saturation stage consist of a saturation stage with dominant even harmonics (HARD) and with dominant odd harmonics (SOFT). The saturation effect is dependent of the signal strenght so the degree of saturation in the pre- mode is controlled by the strenght of the incomming signal and in the post mode by the level of the outgoing signal from the filter(s). MIX

The MIX controls the proportion between the incomming "dry" audio signal and the "wet" signal from the filter with pre and post saturation circuit. The MIX works in stereo mode and it can be controlled manually by knob MIX and be the CV signal MIX. The direct outputs, LPF, BPF and HPF are not affected by the MIX.

https://www.cwejman.net/mmf-2.htm