MMF-1S  マルチモード・フィルター

Multi Mode Filter

３ユーロラックモジュール (3U)
幅 : 20 HP 幅 (1HP=5.08mm)
奥行き: 20mm (フロントパネル裏からの奥行き）
重さ: 0.4kg
電流 current draw: 50mA

コネクター使用上の注意

MMF-1SはMMF-1にアディショナルファンクションを備えています。コンプレッサー、リゾネーターモード（Q peak mode )、サチュレーション、セカンドハーモニックブースター(2ND HARM)がありオリジナルシグナルをMIXできます。VCAミックス（スイッチ）ボリュームコントロール。VCAとMIXはエクスターナル・シグナルによってコントロールできます(VCA-MIX) 。MODE には７つのセレクト可能なフィルタータイプ（ローパス、バンドパス、ハイパス、３つのデュアルバンドパス、ノッチ）があり２つのスロープ（SLOPE 12dB、 24dB per octave）をスイッチで選べます。
マニュアルコントロールできるサチュレーション(SAT) インプット。

コンプレッサー（SATURATION  COMPRESSOR  RATIO でレシオ3:1/1:1/20:1をスイッチで選択できます。
QPEAK MODEではOSCモードかRESモードをスイッチで選択できます。

MMF-1S Multi mode filter

3U Eurorack module
20HP wide
20mm deep
Weight 0.37 kg
current draw: 50mA
How to use Cwejman

MMF-1S is MMF-1 plus (1)Compressor, (2)Resonator mode (Q peak mode), (3)Saturation, (4)2nd harmonic booster (2ND HARM), (5)MIX mixing original signal with (1)(2)(3)(4) or VCA mode. ( MIX VCA outputs ) .
The Multi Mode Filter offers seven types of modes:
* Low pass
* High pass
* Band pass
* Dual band pass——-with dual resonance (Q-PEAK) and controlled bandwidth by SPACING
* Dual band pass——-with single upper resonance (Q-PEAK) and controlled bandwidth by SPACING
* Dual band pass——-with single lower resonance (Q-PEAK) and controlled bandwidth by SPACING
* Notch——————with single or dual resonance (Q-PEAK) and controlled bandwidth by SPACING

The SLOPE defines how steep the filter cuts off the attenuated frequencies. It means, that the 2 pole filter cuts signal with 12dB/octave, the 4 pole filter cuts with 24 dB/octave. The higher the slope, the more effective the filter cuts. The CUTOFF frequency or corner frequency defines at which frequency the filter starts to attenuate frequencies of the incoming signal. The cutoff frequency of the filter can be adjusted by CUTOFF knob from 16kHz to 16Hz and tracked by the external signals CUTOFF CV1 and CV2.

The Q-PEAK (also known as “resonance” or “emphasis”) boost audio signals in the near range of the cutoff frequency and makes the tone sound more “cutting”. From a certain level on, the filter start o self-oscillate and works as a sine wave-oscillator and in dual band pass mode (in dual Q-PEAK mode) produces two-tone sine waves (the two-tones frequencies are controlled by CUTOFF and SPACING).
The q-peak can be controlled by knob Q-PEAK and/or by signal from levelled input Q-PEAK CV, levelled by Q-PEAK CV knob.

The SPACING control defines bandwidth for all three dual band pass modes and/or spread of two resonant peaks. The amount of spacing can be controlled by knob SPACING and/or by signal from input SPACING CV.

The audio knobs AUDIO1 and 2 controls the audio signals level coming from inputs AUDIO1 and AUDIO2.
The audio output is provided by output socket labelled AUDIO and is revealed by white surround.

MMF-1S is the expanded MMF-1 with voltage controllable saturation with compression and second harmonic emphasis, then a MIX parameter for fine timbre tuning between original and processed distorted sound or a VCA at the output.

The filtered signal is emitted at the MMF output.

The second part of the module is comprised of a saturation stage which distorts the signal in a nonlinear fashion. Besides the voltage controllable Saturation parameter which sets the amount of saturation, there’s a 2ND HARM control emphasizing the second order harmonics.
A compressor with three selectable compression ratios (1:1, 3:1 and 20:1) is integrated in the saturation stage as well.

The saturated signal is available at the MIX VCA output, yet the result depends on the VCA/MIX switch and the MIX control:
In switch position “MIX” the MIX parameter blends between the original signal (AUDIO 1&2) and the filtered/saturated result (SAT). This can be voltage controlled via the “CV VCA-MIX” socket.
In switch position “VCA” the MIX control has no effect and the CV input “VCA-MIX” turns into the VCA’s CV input.

External links and demos

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MMF-1