QMMF-4
QUAD MULTI MODE FILTER - RESONATOR
Master section ( CUTOFF, WET, LEVEL, MIX )
QMMF-4 contain of 4 individual filters which can be controlled separately and by the master controls.
CUTOFF Hz : 16Hz – 16kHz
FINE TUNE : for fine tuning of cutoff frequency
Q-PEAK : resonance control of the filter from flat to self oscillating mode in OSC SAT or OSC position and there is RES mode as a resonator.
OUTPUT FADER : volume control of the filter’s output. There are 2 outputs ( PRE, POST ) . PRE is the direct output from the filters, POST is the attenuated output controlled by OUTPUT FADER and by external signals inserted to LEVEL inputs.
INPUT LEVEL : audio input manual controller.
3 Filter mode (HP: High pass , BP: Band pass ,LP :Low pass ).
NOTCH output : a sum of lowpass and high pass.
AUDIO INPUTS : individual audio inputs for all filters, pre-patched to the master control but can be used for four external sound sources.
CM1 : cutoff modulation with manual BIPOLAR level control for the inserted external modulation signals.
CM2 CAL: input for external modulation source and calibrated for 1 volt per octave.
Q-PEAK : manual and voltage controlled amount of filter resonance.
LEVEL : controlled the outgoing level of the filters (POST ) manually and by external signals.
12 pole
MASTER SECTION :
CUTOFF : controls all 4 filter cut offs
WET LEVEL : controls all 4 filter volumes
MIX : controls the mix of dry and wet signals.
Master section has 2 audio outputs (NOTCH and MMF )
NOTCH : it is different from other filter notches, it is the sum of all 4 filters but with inverted phases of F2 and F4.
MMF: it is the sum of all 4 filters. It creates pseudo stereophonic effect.
Master section’s CV controls
FREQ : cutoff frequency, calibrated for all filters for 1 volt per octave.
LEVEL : external signal controlled master level.
MIX: controlling MIX.
46hp
power consumption: 190mA
Difference between OSC mode and RES mode
- In OSC mode there is normal feedback and the filter can completely self-oscillate.
There is also oscillation without an input signal.
- In RES mode there is damping of the feedback which causes a resonance around the input signal / cutoff freq.
If there is no input signal then the resonance dies out.
The key differences between the RES-4 and the QMMF-4 :
The RES-4 is a true resonator, while the QMMF-4 is a multi-function machine. Therefore, the internal circuits are slightly different. The basic design is fairly similar, but the RES-4 is specifically designed as a resonator, while the QMMF-4 also has the ability to function as a VCF. This means the design differs from the RES-4, which can be noticeable in its use and sound. Therefore, you can't fully compare the RES-4 to the QMMF-4 if the QMMF-4 is in RES and BP mode, there will be differences.
Furthermore, the RES-4 has only one main audio input, which distributes the audio signal across the four resonators, while the QMMF-4 has a dedicated input for each channel. This means that (if you use the audio signal as a PING trigger), the RES-4 can only trigger all four channels simultaneously, while the QMMF-4 allows you to send a trigger/audio signal per channel. If you want to trigger on the feedback loop, you can trigger per channel on the RES-4 using the BW input, and per channel on the QMMF-4 using the Q input.