MATRIXSYNTH: Soundforce Dual Filter // "affordable" dual LP or HP OTA based filter in Eurorack

Saturday, December 21, 2019

Soundforce Dual Filter // "affordable" dual LP or HP OTA based filter in Eurorack


Published on Dec 21, 2019 DivKidVideo

Available at Signal Sounds for £129.00.

"Here we have the new Dual Filter Eurorack module from Soundforce. It’s an OTA based design that has it’s routes in the later updated Korg MS-20 filter cores. The Dual Filter is a dual independent mono filter where each of the filters can be set to low pass or high pass filter modes with jumpers on the back of the module. Patching one side into the other we can make HP-LP series processing chains, patch in dual mono, stereo or parallel processing and we can also make band pass filters by using both sides.

TIMING INDEX // SECTIONS
00:00 Hello & video previews
01:20 What is the Dual Filter? Features explained.
02:34 Raw sound demo, LP + HP sweeps
03:50 A quick note about signal levels
04:56 Stereo dual low pass filter
06:03 Stereo dual high pass filter + bass post low end tricks
08:23 Patch your own a band pass filter (crusty ambient)
10:34 Further band pass demonstration and bandwidth fading tricks
13:36 A note about affordability
14:56 Oscillating filter tricks - kick drum synthesis + filter pings
17:07 Dual oscillator filter quirky techno
17:23 Audio rate modulation - new overtones, vocal tones, formant & glottal harmonics
19:00 Musical audio rate modulation sequences for FM synthesis and phase modulation style sounds
20:35 Bandwidth adjusting drones
22:12 Swirling ambiences"


"The SoundForce Dual Filter is a 2-stage cascaded OTA design based on the late MS-20. The design has been fine-tuned with extended resonance control as well as a resonance CV input. Each filter can be either a 12dB/oct low-pass or 6dB/oct high-pass. To keep the module HPs on the low side, the filter mode setting is located on the back of the module. The module was designed to be a very affordable full-featured modern filter.

Highly efficient design:
This design attracted me very particularly due to its beautiful simplicity. With only 2 poles, it uses a total of 3 OTA ICs and 4 OP-AMP ICs for both filters even with the added resonance voltage control. Early on, efficiency and part counts were a focus during testing and development. In combination with automated manufacturing and a very short supply chain, the module has a very high quality standard at a very affordable price. The module uses only A-brand ICs and passive and no costs were cut during purchasing."

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